OF THE 
 UNIVERSITY 
 
RESULTS 
 
 GIFT 
 
 OF THE MAY 29 1930 
 
 METEOROLOGICAL OBSERVATIONS 
 
 MADE AT THE 
 
 BLUE HILL METEOROLOGICAL OBSERVATORY, 
 
 MASSACHUSETTS, U. S. A., 
 
 6) 
 
 THE YEAR 1886: 
 
 UNDER THE DIRECTION OF 
 
 ROTCH, S. B. 
 
 BOSTON : 
 
 ALFRED MUDGE & SON, PRINTKKS, 
 
 No. 24 FRANKLIN STHEKT. 
 
 1887. 
 
SUNSHINE RECORDS 
 
 FOR DESCFll PTIOM OF INSTRUMENTS SEE FWO-E. VIII. 
 " " PHENOMENA -" 
 
 CA MPBEL L - S TO K S . 
 
 
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RESULTS 
 
 OF THE 
 
 METEOROLOGICAL OBSERVATIONS 
 
 MADE AT THE 
 
 BLUE HILL METEOROLOGICAL OBSERVATORY, 
 
 W . 
 
 MASSACHUSETTS, U. S. A., 
 
 THE YEAR 1886 
 
 UNDER THE DIRECTION OF 
 
 LAWRENCE ROTCH, 8. B 
 
 BOSTON : 
 
 ALFRED MUDGE & SON, PRINTERS, 
 
 No. 24 FRANKLIN STREET. 
 
 1 887. 
 
ERRATA AND ADDENDA 
 
 TO THE 
 
 BLUB HILL OBSERVATIONS FOR 1886. 
 
 Page viii. To the description of the Sunshine Recorders, add : " Records of both 
 the instruments are given in the Frontispiece." 
 
 Pages 3 to 7. Supply the following omitted dates on which western mountains 
 were visible : 
 
 Nobscot : March 22, June 22, August 4, November 22. Wachusett : Decem- 
 ber 28. Monadnock : July 12. 
 
 Page 3 ; April 7. Amount of sunshine, read Oh. 6m., instead h. m. 
 
 Page 3 ; April 7. Per cent of sunshine, read 01, instead 00. 
 
 Pages 3 and 8. Duration of bright sunshine for April, read 177 h. 25 m., 
 instead 177 h. 19 m. 
 
 Page 8. Duration of bright sunshine for year, read 2,098 h. 19 m., instead 
 2,098 h. 13 m. 
 
 Pages 16 to 27. The total wind movements for each day are not always the 
 exact sums of the hourly movements, as they were otherwise obtained. 
 
 Page 18. Mean wind movement for March, 3-4 p. M., read 25.4, instead 2.54. 
 
 Page 31. Sum for last eight days of February, at 2 p. M., read 232.400, instead 
 332.400. 
 
 Page 32. Monthly sum for March, at 10 p. M., read 904.303, instead 304.303. 
 
 Page 39. In the sums for the last eleven days of October, from 5 A. M. to 11 
 p. M., inclusive, the three left-hand figures of each column read 323, instead 393 or 293. 
 
 Page 44. In the description of the phenomena of April 7, insert: "For the 
 automatic sunshine record, see the Frontispiece to this volume." 
 
 Page 45. To the mention of the humidity record of November 4, add: "The 
 record of this day's sunshine is shown in the Frontispiece." 
 
CONTENTS. 
 
 INTRODUCTION TO THE BLUE HILL OBSERVATIONS. 
 
 AN ACCOUNT OF THE OBSERVATORY. PAGK 
 
 ITS HISTORY AND PERSONNEL. ............... v 
 
 ITS LOCATION AND DESCRIPTION .............. v 
 
 ITS AUXILIARY STATIONS ................ v 
 
 THE INSTRUMENTS AT THE OBSERVATORY. 
 
 ItKMARKS CONCERNING THE SELF-RECORDING INSTRUMENTS , ' ...... vi 
 
 BAROMKTERS .................. vi 
 
 THEBKOMETEBS AND HYOBOUKTBBS .............. vi 
 
 ANEMOSCOPE AND ANEMOMETERS .............. vii 
 
 RAIN AND SNOW GAUGES ................ vii 
 
 SUNSHINE AND CLOUD INSTRUMENTS ............'.. viii 
 
 THE REDUCTION OF THE OBSERVATIONS. 
 
 GENERAL RESULTS ................. viii 
 
 HOURLY VALUES FROM THE SELF-RECORDING INSTRUMENTS .......... ix 
 
 RESULTS OE THE OBSERVATIONS. 
 
 GENERAL RESULTS OF THE OBSERVATIONS ............. 2-8 
 
 NUMBER OF HOURS OF PREVALENCE OF EACH WIND ........... 10-13 
 
 HOURLY MEASURES OF THE HORIZONTAL MOVEMENT OF THE WIND ........ 16-28 
 
 HOURLY VALUES OP THE ATMOSPHERIC PRESSURE ........... 30-42 
 
 TRACINGS FROM THE SELF-RECORDING INSTRUMENTS TO ILLUSTRATE CERTAIN PHENOMENA. 
 
 DESCRIPTIVE TEXT ................. 44, 45 
 
 PLATES, Nos. 1 TO 9. 
 
INTRODUCTION TO THE BLUE HILL OBSERVATIONS, 
 
 AN ACCOUNT OF THE OBSERVATORY. 
 
 Its History and Personnel. The Blue Hill Meteorological Observatory was established as a private 
 observatory by the undersigned in 1885, and is now one of the best equipped meteorological stations in the 
 United States. Tri-daily observations were commenced Feb.,1, 1885, and have since been regularly made at the 
 hours of 7 A. M., 3 and 11 p. M., seventy -fifth meridian time, adopted by the United States Signal Service. 
 Monthly summaries of these observations have been sent to the New England Meteorological Society for 
 publication in its Bulletin, to the Signal Service for its Weather Review, and to persons interested. A summary 
 of the observations for the year ending Jan. 31, 1886, together with a summary of the corresponding observations 
 made at the Boston Signal Service station, ten and one half miles north of and five hundred and fifteen feet below 
 the observatory, was printed and distributed. Besides the regular meteorological observations, considerable 
 experimental work has been done, notably in weather predictions. Details of this work may be found in a 
 pamphlet by the undersigned, printed not published, entitled An Account of the Foundation and Work of the 
 Blue Hill Meteorological Observatory. 
 
 The current expenses of the observatory, amounting to about $2,500 a year, are paid by the undersigned, 
 who directs the work. Mr. Willard P. Gerrish was the observer during the first year, and since that time the 
 position has been filled by Mr. H. Helm Clayton. Frank Brown has acted as steward from the opening of 
 the observatory. 
 
 Its Location and Description. Great Blue Hill, upon whose summit the observatory stands, is situated 
 in Norfolk County, Massachusetts, partly in the town of Milton and partly in that of Canton. The elevation 
 above sea level is about nix hundred and thirty-five feet, and it is thus not only the highest land in eastern 
 Massachusetts, but is also the highest point within ten miles of the Atlantic coast from Maine to Florida. Great 
 Blue Hill exceeds the other summits of the Blue Hill range by more than one hundred feet, and the surrounding 
 country being low, its exposure is free in all directions, which renders it admirable as a site for a meteorological 
 station, uninfluenced by the causes which affect the records of most of the Government Signal Stations. A road 
 nearly a mile long, and practicable for carriages, has been built up the hill, and a telephone line connects the 
 observatory with Boston. The position of the observatory is fixed by a brass plate on the lower floor of the 
 tower. This marks the supposed site, 2.2 feet below the plate, of the copper bolt set by Simeon Borden, about 
 1834, for the Massachusetts Trigonometrical Survey, in latitude 42 12' 44" N., longitude 71 6' 53" W., and 
 (535.05 feet above mean tide. The bolt set by the United States Coast and Geodetic Survey, in 1844, is 27.35 
 feet N. 11 16' E. of the supposed site of the Borden bolt. 
 
 The observatory itself is a two-story circular tower, twelve feet in diameter inside and twenty-five feet 
 high, built of the broken stone found on the hill. This contains some of the instruments, others being exposed 
 above its fiat roof which is surrounded by a parapet. Extending southward from the tower is a one-story hip- 
 roof house with two bedrooms, a dining-room and kitchen. This is also built of stone, but has a wooden shed 
 attached. In the construction of the building every precaution was taken to insure solidity, the walls being 
 twenty inches thick and the roof securely anchored to them. It has, however, been found impossible to make 
 the walls impervious to rain which is driven by the high wind through the minute cracks which the stone must 
 contain, and several coats of marine varnish have not rendered it water-proof. A large stove in the lower room 
 of the tower heats the upper room through a register, and by its flue and that of the kitchen range also warms the 
 other rooms. In the cellar is a wooden tank which collects the rain falling upon the roof. A safe built into the 
 chimney protects the records and charts from fire. The cost of the building, designed by Messrs. Rotch and 
 Tilden, was about $3,500. 
 
 Its Auxiliary Stations. A station was established July 1, 188(5, at the foot of the hill, four hundred and 
 forty feet below the observatory and three quarters of a mile northwest of it, which is visited daily. It is provided 
 with maximum and minimum thermometers and a Draper thermograph exposed in a Hazen shelter, and with a 
 rain gauge similar to that on the hill. Some curious variations of temperature and precipitation between the two 
 stations have been noted, but enough data has not yet been accumulated for publication. Another station in 
 Milton and one in the neighboring town of Randolph send monthly records of temperature and precipitation to 
 the observatory, which receives reports of the synchronous observations made at the Boston Signal Service 
 station. 
 
 ' (V) 
 
THE INSTRUMENTS AT THE OBSERVATORY. 
 
 Remarks concerning the Self-Recording Instruments. A feature of the instruments is their automatic 
 record, the "eye" observations of the standard instruments serving only as a control upon the registration. 
 With the exception of the force of the wind, the species of clouds and their direction of motion, all the elements 
 observed are recorded continuously. So far as possible, the principle of having duplicate instruments for use in 
 case of accident is applied. The register sheets of all the instruments are changed daily at 11 p. M., at which 
 hour the meteorological day ends. 
 
 Barometers. The barometers are kept in a glass case in the lower room of the tower, where the tem- 
 perature is most uniform, though a considerable range of temperature necessarily occurs in winter between the 
 day and the night. The barometer cisterns are six hundred and forty feet above mean tide. 
 
 The standard since November, 1885, is Hicks, No. 818. This barometer is constructed on the Fortln 
 system, has a tube about 0.5 inch in diameter, and is read by a vernier directly to 0.002 inch. The instrumental 
 correction, as determined atKew Observatory, in October, 1885, is +0.009 inch, including capillary action. As 
 compared indirectly with the Signal Service standards at Washington, in February, 1886, its corrected readings 
 are 0.015 inch too low. A Green barometer, No. 2,677, of the Signal Service pattern, reading also to 0.002 
 inch, is kept as a reserve instrument. It was formerly used as the standard, its readings being 0.017 inch lower 
 than the assumed Kcw standard now adopted by the observatory. 
 
 A Draper self-recording mercurial barometer, in a glass case near the other barometers, has given an 
 almost continuous record since May, 1885. The principle of this instrument, which was constructed by Black 
 arid Pfister, of New York, is as follows : A glass tube thirty-six inches long, with the upper portion of larger 
 diameter than the lower, is held firmly in a vertical position, and filled in the usual manner with quicksilver; its 
 lower or open end dips into a tube or reservoir containing the same metal. This reservoir is suspended on two 
 spiral steel springs, and has freedom of motion up and down. When the pressure of the atmosphere diminishes, 
 a portion of the mercury flows out of the tube into the reservoir ; this, becoming heavier, stretches the steel 
 springs, causing the ink pencil fastened to them to mark downwards. If the pressure increases, the reverse 
 movement takes place. The ink pencil makes its mark on a ruled paper register, carried at the rate of half an 
 inch per hour from right to left by a clock. The movement of the pencil on the register can be magnified to 
 any extent by increasing the length of the spiral springs ; in this instrument it multiplies three times. The ink 
 pencils used in the Draper instruments are tubes of glass filled with red ink, which touch lightly against the 
 paper register ; the advantage of these over lead pencils is that little or no pressure is required. This barograph 
 gives the correction for temperature, or reduction to 32, from the fact that it weighs the column of mercury 
 instead of measuring its length, which is affected by heat. There is a slight temperature error caused by the 
 unequal bore of the tube and by the expansion of the steel springs, but this is very small. Since July, 1885, the 
 record has been checked by daily comparisons with the standard barometer, and the barograph is now so well 
 regulated that the average correction is only 0.01 inch. Tracings of the barograph, somewhat reduced in size, 
 are shown in Plates Nos. 1 and 1 A, at the end of this volume. 
 
 An aneroid barograph, made by Richard Brothers, of Paris, is kept as a reserve instrument. It consists 
 of eight small aneroid boxes placed one above the other, which, by means of a pen on the end of a lever, register 
 the variations of atmospheric pressure upon a paper-covered drum, which is revolved by clockwork inside. 
 Unlike the Richard instruments in general, the drums of those constructed for this observatory revolve once a 
 day instead of once a week, thereby making the time scale much larger. For an aneroid barometer this is 
 remarkably accurate. 
 
 Thermometers and Hygrometers. These are exposed in a wooden louvre shelter built from a north window 
 of the tower, fifteen feet above the ground. In its construction special pains were taken to secure ventilation by 
 making the roof double and setting the shelter six inches out from the wall, and to cut off radiation from inside 
 the tower by having double windows. Comparisons have been made between this shelter and an isolated one 
 built according to Prof. H. A. Hazen's specifications, now adopted by the Signal Service as the standard. Except 
 during rapid changes of temperature, when the wall shelter was somewhat sluggish, the error of the latter was 
 less than -(-0.5. For convenience the window shelter is employed. 
 
 The observatory standard thermometers are Hicks, No. 252,161, verified at Kew, and Baudin, No. 10,682. 
 The working standards are H. J. Green wet and dry bulb and maximum and minimum thermometers. These 
 have been frequently compared with the standard instruments, and the resulting corrections applied. 
 
 A Richard thermograph has been in use since April, 1886. This instrument has a curved brass tube filled 
 with alcohol, which straightens by the expansion of the alcohol when the temperature rises, and recurves again 
 when the temperature falls and the alcohol contracts. The motion of the tube is registered on a drum by means 
 of a pen on a lever. The error of the thermograph, ascertained several times daily by comparison with the 
 standard thermometer, is not more than 0.5, except for the maximum and minimum temperatures which are 
 obtained from the maximum and minimum thermometers, and their hours of occurrence only from the thermograph. 
 In cold weather a Koppe hair hygrometer, made by Hottinger, of Zurich, has been used to determine the 
 relative humidity and the dew point. In winter the mean relative humidity given by the hair hygrometer is 
 about six per cent lower than that calculated from the readings of the wet and dry bulb thermometers, which are 
 
 (VI) 
 
known to give erroneous results ;it low temperatures. In summer the mean relative humidity obtained by the 
 two methods agrees within one per cent. An Alluard condensation dew point apparatus is occasionally used as 
 a check upon the other instruments. 
 
 A Richard registering hygrometer has been in use since April, 188(i, and has given satisfactory results for 
 such an instrument, its error relative to the hair hygrometer or psychromcter being noted several times daily. 
 The hygrometric material employed is a thin strip of horn, whose alteration in length with variations of moisture 
 is registered, as in the thermograph, upon a drum, which revolves once a day, giving a time scale of three tenths 
 of an inch per hour. Sheets from these instruments are shown in Plates Nos. 2 to 5, slightly reduced in size. 
 
 Anemoscope and Anemometers. The instruments for measuring the direction, velocity, and force of the 
 wind are exposed about ten feet above the roof of the tower and thirty-five feet above the ground. 
 
 A Draper recording anemoscope and anemometer, made by Black and Pfister, have given almost 
 continuous records since March, 1885, with the exception of short periods when repairs were necessary. The 
 anemoscope is constructed as follows : From the wind vane a vertical shaft descends into the tower. The lower 
 end of the shaft carries a brass cylinder covered with paper to receive the record of the oscillations of the wind. 
 An ink pencil, bearing lightly against the paper, descends from the top to the bottom of the cylinder in the 
 course of twenty-four hours, its movement being regulated by a clock. When the wind shifts, the paper register, 
 therefore, correspondingly turns and the pencil makes a trace of the movement ; if there is a calm, the pencil 
 makes a straight line downward, a gentle breeze being sufficient to cause the cylinder to oscillate on each side of 
 its mean direction. On the sheet of paper are printed the eight points of the compass and the hours, the trace 
 thus showing the direction and all the variations of the wind, with the times of their occurrence. A reduced 
 copy of the anemoscope sheet, after removal from the cylinder, is given in Plate No. 7. 
 
 The principle of the Draper anemometer is this : On the ends of a cross supported by a vertical shaft are 
 four hemispherical cups, which, by the action of the wind, are caused to revolve with a speed, as determined by 
 Dr. Robinson, of about one third the velocity of the wind. On the lower end of the shaft, thus made to revolve 
 by the cups, is an endless screw connecting with a train of wheels which move a cam. This is so arranged that 
 one turn of the cam corresponds to twenty miles movement of the wind. An ink pencil, Avhich rests on the edge 
 of the cam aixd slides in vertical guides, is carried by each revolution of the cam from the bottom to the top of a 
 sheet of paper, which is drawn aside by a clock at the rate of half an inch per hour. Th(5 number of times that 
 the pencil moves from the bottom to the top of the paper, multiplied by twenty, gives the number of miles that 
 the wind has travelled in an hour or day. A reduced copy of the anemometer sheet is shown in Plate No. 6. 
 
 A smaller Robinson anemometer records electrically by the Gibbon self-register each mile travelled by 
 the wind. This apparatus, which is that made for the Signal Service by the Hahl Manufacturing Company, of 
 Baltimore, has been used during 1886. On account of the open time scale of the register (two inches per hour), 
 it serves to show the velocity of brief gusts of wind better than does the Draper anemometer, and is also available 
 to supply breaks in the latter record. 
 
 The average movements recorded by the Draper and Signal Service anemometers differ by less than one 
 per cent. The latter instrument, in a series of tests, gave about five per cent lower velocities than did a Hicks 
 portable anemometer, whose dial was graduated at Kew Observatory by comparison with the standard 
 anemometer. 
 
 A wind pressure gauge, constructed from the writer's designs by the Crosby Steam Gauge Company, of 
 Boston, has been in use during 1886. A vane keeps a disk with a square foot of surface normal to the wind, 
 whose pressure stretches a spring in the tail of the vane and leaves an index at the maximum pressure in pounds, 
 to which it has been subjected. After the pressure has been converted into velocity by the formula v = \Oi.. 
 where v is the velocity in miles per hour, and p is the pressure in pounds per square foot, the velocity thus 
 obtained agrees closely with the maximum velocity foi a period of five minutes, as registered by the Signal 
 Service anemometer. The extreme velocity of the gusts would naturally be expected to exceed the mean velocity 
 for five minutes, and this is generally found to be the case. The agreement is closest at moderate velocities, but 
 whether this is owing to the inertia of the pressure plate causing it to be sluggish with light winds, or whether 
 the velocity of the gusts exceeds in a greater ratio the mean velocity during high winds than during low winds, 
 has not been determined. 
 
 Rain and Snow Gauges. Three of these have been used during 1886. They are placed near one 
 another in a freely exposed position, one hundred and fifty feet northeast of the observatory, with their rims 
 within two feet of the ground. 
 
 The standard rain gauge is a copper cylinder, fourteen inches deep, with a turned brass rim eight inches 
 in diameter. The rain is measured with a stick in a tube having one tenth the area of the receiver. This is the 
 gauge recommended by the New England Meteorological Society. To ascertain the rainfall during a storm 
 without emptying the gauge, it is weighed upon a spring balance compensated for the weight of the empty gauge 
 and graduated to indicate 0.02 inch. 
 
 The standard snow gauge has an aperture similar to the rain gauge. The receiver is sixteen inches deep, 
 and is enlarged below to keep the snow from blowing out, this plan having been tried in Europe. The gauge, 
 with the unmelted snow, is weighed upon the spring balance, which is compensated as before for the weight of 
 
 (VII) 
 
this empty gauge. This method obviates loss by evaporation in melting the snow for measurement, and enables 
 the snowfall to be quickly ascertained. 
 
 The self-recording rain and snow gauge constructed after the writer's design, by Richard Brothers of Paris, 
 has been in use since March, 1886. The receiver in this gauge rests upon a platform balance, and when rain 
 falls its weight causes the balance to record the amount and time of occurrence of the rain upon a revolving drum, 
 as in the other Richard instruments. Tracings of this gauge, slightly reduced in size, are shown in Plates Nos. 
 8 and 9. To adapt it to snow another receiver is used, which is deeper, with an inner shield to prevent clogging 
 by sleet. The author believes this to be the first successful attempt to record snow automatically without first 
 melting it. The records of the registering gauge agree fairly well with those of the standard with which they are 
 compared. The former gauge has been surrounded by a flaring wire screen on the Nipher system to protect it 
 from the wind, and more snow has thereby been caught in windy weather than before. 
 
 Sunshine and Cloud Instruments. The sunshine recorders are placed on the south parapet of the tower, 
 with no obstructions to affect their records. A level stand in the centre of the tower roof with a meridian 
 reference line serves as a base for the cloud mirror. 
 
 A Campbell-Stokes sunshine recorder, which has been in opei-ation during 1886, is the standard instrument 
 in Europe for registering sunshine, but it is believed that there are none used in the United States. It consists 
 of a glass ball held in a concentric frame at the distance of the focal radius from the centre of the ball. This 
 frame holds a strip of cardboard which is charred whenever the sun shines brightly, and by the apparent motion 
 of the sun the hours into which the cardboard is divided are successively traversed by its image. The strip 
 is adjusted in the frame to give approximately the standard time of the seventy-fifth meridian. 
 
 A Jordan sunshine recorder, made by Negretti and /ambra of London, has also been in use the past year. 
 A brass cylinder, with its axis parallel to the earth's axis, has in its opposite sides two holes through which 
 the sun shines upon sensitized paper, and the traces thus made are rendered permanent by immersing the paper 
 in water. This generally records more sunshine than does the burning instrument, whoso action is stopped when 
 the sun is partly obscured by cirrus clouds or light haze. 
 
 A cloud mirror for the measurement of the azimuth and altitude of clouds has been used by Mr. Clayton. 
 Frequent measurements, in degrees of azimuth, of the direction of motion of the clouds, particularly those of the 
 cirrus type, have been made but are not ready for publication. The altitude of the clouds is obtained by first 
 calculating their velocity of motion by noting the time which their shadows require to traverse known distances 
 on the plain below. Only clouds of the stratus and cumulus types give shadows which can thus .be used. The 
 velocity of a cloud being known, two angular measurements of its altitude, at a definite interval of time apart, 
 enable its height to be calculated. 
 
 THE REDUCTION OF THE OBSERVATIONS. 
 
 General Results. The daily results refer to the twenty-four hours ending at 11 r. M. The figures in the 
 first four columns following the date, pages 2 to 7, are the daily means obtained from observations at 7 A. M., 3 
 and 11 P. M., seventy-fifth meridian time, according to the practice of the Signal Service. Until April, eye 
 observations were taken at these hours ; after that, the data for 7 A. M. and 3 ]. M. were generally obtained from 
 the sheets of the self-recording instruments, controlled by eye observations of the standard instruments made; 
 at least twice a day. 
 
 All temperatures are expressed in Fahrenheit degrees. 
 
 The table used for the reduction of the barometer to 32 ta that computed from Schumacher's formula, 
 and contained in the Instructions for Voluntary Observers of the Signal Service. The reduction to sea level 
 from a height of six hundred and forty feet is effected by a table calculated from Laplace's formula, in which the 
 arguments are the temperature of the external air and the height of the barometer corrected to 32. The cor- 
 rection to reduce to the standard gravity of latitude 45, is 0.007 inch, which is the constant employed by 
 the Boston Signal Office. The barometer reduced to sea level and standard gravity is only used in the monthly 
 and annual means and extremes. The actual barometer is also given in the means. 
 
 The dew point and relative humidity are calculated from the readings of the wet and dry bulb ther- 
 mometers, by means of the table, computed for a barometric pressure of thirty inches, contained in the above 
 Instructions; or inversely, the dew point is calculated from the relative humidity, when such is obtained from 
 the hygrometer. 
 
 The hours of actual sunshine are got from the Campbell-Stokes instrument, and the daily percentage of 
 possible sunshine is determined from the average possible duration of sunshine in latitude 42, which is given for 
 each month in Jelinek's Anleitmvj zur Ausfiihrun</ Meleorologisclter I3eobachtti>i(/en, revised by Dr. Ilann. From 
 the number of hours thus found, thirty minutes are subtracted daily to allow for the time when the sun, on 
 account of its proximity to the horizon, does not affect the register. 
 
 The mean cloudiness for the first three months was obtained from tri-daily eye observations. After March 
 it is assumed to be the complement of the percentage of bright sunshine, the cloudiness thus got having been 
 found here and elsewhere to be about four percent less than that obtained from eye observations. In the Annual 
 Summary, page 8, the mean cloudiness has been obtained from the sunshine for all the months. 
 
 (VIII) 
 
The transparency of the air from March to December, inclusive, is indicated by the record of visibility of 
 distant mountains, which subtend about the same visual angle as seen from Blue Hill, the highest mountains 
 being the most distant. The height above the sea of Nobscot is 002 feet ; Wachusett, 2,018 feet ; and Monad- 
 nock, 3,170 feet ; their distances from Blue Hill being as stated in the records. 
 
 The prevailing direction of the wind and its daily movement are omitted from* these tables, because they 
 appear in the Hourly Values, pages 10 to 28. In the Annual Summary, page 8, the table of monthly means and 
 totals is compiled from the preceding monthly sums and means. The figures for sunshine and precipitation, and 
 the number of days with precipitation which are given as yearly means, are, strictly speaking, the monthly aver- 
 ages of these elements for the year. In the table of monthly extremes, the first three columns should be 
 headed "Barometer Reduced to 32, Sea Level and Standard Gravity," instead of "Pressure," etc., as printed. 
 
 Hourly Values Jrom the Self-Recording Instruments, The tabulation of all the sheets from these instru- 
 ments has been done by Mr. Clayton, so that the personal equation introduced is nearly constant. The figures 
 in the tables have been added by the arithmometer of Thomas de Colmar. The maximum values are indicated 
 in the sums and means of the pressure and wind velocity, and in the annual summary of the wind direction, by 
 heavy-faced type, and the minimum values by light-faced type. The ten-day means of pressure and wind velocity 
 can be easily obtained from the ten-day sums by moving the decimal point. 
 
 The hours of prevalence of each wind, pages 10 to 13, need no special explanation. The anemoscope from 
 which the data are derived gave a continuous record during the year except on Jan. 30, when the action of the vane 
 was impeded by ice, and on thirty-two hours distributed through the year, when the direction of the wind was 
 otherwise obtained. Only two hours of calm are given, but the record of the sensitive electrical anemometer 
 shows that in reality there were no absolute calms of an hour's duration during the year. 
 
 The hourly wind movements, pages 16 to 28, are also continuous with the exception of the last four days 
 of January, when both anemometers were stopped by ice. A few other breaks in the Draper record, besides the 
 values for very low velocities, have been supplied by the records of the electrical anemometer. The two hours of 
 calm, before mentioned, however, remain. 
 
 The hourly data for the atmospheric pressure, pages 30 to 42, are complete for each hour, the values for 
 four scattered hours, missing from the Draper barograph sheets, having been interpolated. The figures given are 
 the readings, corrected for temperature and instrumental error, the latter being ascertained several times daily, 
 and the correction for each hour interpolated. For economy in printing the hourly values, twenty-nine inches is 
 omitted, unless the pressure for the same hour of the preceding day is twenty-eight or thirty inches ; and twenty- 
 nine is to be supplied elsewhere when no whole inches are given. The double diurnal maxima and minima are 
 indicated in the sums and means by heavy and light faced type. 
 
 These are among the most complete hourly values of wind velocity and atmospheric pressure which have 
 been published for a few stations in the United States. 
 
 MAY, 1887. 
 
 A. LAWRENCE ROTCH, 
 
 Blue Hill Meteorological Observatory. 
 
 (IX) 
 
GENERAL RESULTS 
 
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 ^11.1 1 1 
 
 
NUMBER OF HOURS OF PREVALENCE OF EACH WIND 
 
 KKFKKKKD TO 
 
 DIFFERENT POINTS OF AZIMUTH, 
 
 KOU 
 
 EACH DAY, MONTH, AND THE YEAR 1886, 
 
 AS DERIVED FROM THE RECORDS OF THE DRAPER ANEMOSCOPE. 
 
FEBRUARY. 
 
 Date. 
 
 S. E. 
 
 s. 
 
 s. w. 
 
 w. 
 
 ST. W. 
 
 N. 
 
 N. E. 
 
 E. 
 
 Calm. 
 
 Dale. 
 
 S. E. 
 
 s. 
 
 S. W. 
 
 w. 
 
 x w. 
 
 N. 
 
 .N. li. 
 
 E. 
 
 Calm. 
 
 1. 
 
 
 
 1 
 
 1 
 
 2 
 
 20 
 
 
 
 
 
 
 
 
 1. 
 
 
 
 
 
 3 
 
 15 
 
 (i 
 
 
 
 
 
 
 
 
 2. 
 
 
 
 
 
 
 
 
 
 5 8 
 
 8 
 
 3 
 
 
 2. 
 
 
 
 
 
 (i 
 
 6 
 
 12 
 
 (1 
 
 (I 
 
 
 3. 
 
 15 
 
 
 
 
 
 
 
 
 
 
 
 
 
 9 
 
 
 3. 
 
 
 
 
 
 
 
 7 
 
 10 
 
 7 
 
 (1 
 
 
 
 
 4. 
 
 24 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 4. 
 
 
 
 
 
 
 
 
 
 5 
 
 19 
 
 (1 
 
 1) 
 
 
 5. 
 
 11 
 
 13 
 
 
 
 
 
 
 
 
 
 
 
 
 5. 
 
 
 
 
 
 
 
 24 
 
 
 
 (1 
 
 (1 
 
 
 8. 
 
 
 
 
 
 3 
 
 21 
 
 
 
 
 
 
 
 
 0. 
 
 
 
 4 
 
 5 
 
 9 
 
 6 
 
 
 
 (1 
 
 
 
 
 7. 
 
 
 
 
 
 23 
 
 1 
 
 
 
 
 
 
 7. 
 
 
 
 2 
 
 16 
 
 5 
 
 
 
 
 
 (1 
 
 (i 
 
 1 
 
 8. 
 
 
 
 
 
 10 
 
 8 2 
 
 4 
 
 
 
 
 8. 
 
 
 
 3 
 
 21 
 
 
 
 
 
 (I 
 
 ii 
 
 
 9. 
 
 2 
 
 1 5 
 
 3 
 
 
 
 3 
 
 7 
 
 3 
 
 
 9. 
 
 5 
 
 3 
 
 9 
 
 7 
 
 
 
 
 
 
 
 o 
 
 
 10. 
 
 
 
 3 
 
 21 
 
 
 
 
 
 
 
 
 
 
 10. 
 
 
 
 
 
 
 
 
 
 
 
 3 
 
 21 
 
 (i 
 
 
 11. 
 
 
 
 
 
 23 
 
 1 
 
 
 
 
 
 
 
 
 11. 
 
 
 
 
 
 
 
 
 
 
 
 24 
 
 
 
 
 12. 
 
 
 
 
 
 10 
 
 14 
 
 
 
 
 
 
 
 
 12. 
 
 9 
 
 6 
 
 
 
 
 
 
 
 5 
 
 4 
 
 
 13. 
 
 
 
 
 
 
 
 11 
 
 5 
 
 5 
 
 2 
 
 1 
 
 
 13. 
 
 1 
 
 18 
 
 5 
 
 
 
 
 
 
 
 
 
 
 14. 
 
 
 
 
 
 
 
 
 
 1 
 
 23 
 
 
 
 
 
 
 14. 
 
 
 
 7 
 
 1C 
 
 1 
 
 
 
 () 
 
 
 
 
 15. 
 
 
 
 
 
 
 
 
 
 15 
 
 1 
 
 5 
 
 3 
 
 
 15. 
 
 3 
 
 9 
 
 10 
 
 2 
 
 
 
 
 
 
 
 
 
 
 1C. 
 
 
 
 
 
 
 
 
 
 11 
 
 13 
 
 
 
 
 16. 
 
 
 
 
 
 1 
 
 21 
 
 2 
 
 (I 
 
 
 
 
 17. 
 
 
 
 
 
 
 
 11 
 
 8 5 
 
 
 
 
 
 
 17. 
 
 5 
 
 7 
 
 C 
 
 6 
 
 (1 
 
 
 
 
 18. 
 
 
 
 
 
 
 
 14 
 
 10 
 
 
 
 
 
 
 
 
 18. 
 
 2 
 
 1 
 
 13 
 
 8 
 
 
 
 
 
 (1 
 
 
 
 
 19. 
 
 4 
 
 
 
 
 
 2 
 
 2 
 
 
 
 4 
 
 12 
 
 
 19. 
 
 5 
 
 18 
 
 
 
 
 
 
 
 
 
 (1 
 
 1 
 
 
 20. 
 
 
 
 
 
 
 
 13 
 
 
 
 1 
 
 2 
 
 2 
 
 
 20. 
 
 
 
 
 
 4 
 
 13 
 
 7 
 
 
 
 
 
 ( 
 
 
 21. 
 
 15 
 
 
 
 
 
 
 
 
 
 1 
 
 3 
 
 5 
 
 
 21. 
 
 
 
 
 
 7 
 
 7 
 
 10 
 
 
 
 (1 
 
 
 
 
 22. 
 
 
 
 
 
 
 
 
 
 2 
 
 18 
 
 4 
 
 
 
 
 22. 
 
 4 
 
 4 
 
 1 
 
 1 
 
 2 
 
 7 
 
 3 
 
 2 
 
 
 23. 
 
 
 
 
 
 4 
 
 6 
 
 14 
 
 
 
 
 
 
 
 
 23. 
 
 
 
 3 
 
 9 
 
 4 8 
 
 
 
 (1 
 
 
 
 
 24. 
 
 
 
 
 
 
 
 
 
 2 
 
 22 
 
 
 
 
 
 
 24. 
 
 
 
 
 
 
 
 
 
 18 
 
 4 
 
 2 
 
 
 
 
 25. 
 
 
 
 
 
 
 
 
 
 
 
 14 
 
 9 
 
 1 
 
 
 25. 
 
 20 
 
 2 
 
 
 
 
 
 
 
 
 
 (l 
 
 2 
 
 
 20. 
 
 
 
 
 
 
 
 
 
 10 
 
 14 
 
 
 
 
 
 
 26. 
 
 
 
 4 
 
 8 
 
 12 
 
 
 
 (l 
 
 II 
 
 
 27. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 21 
 
 3 
 
 
 27. 
 
 
 
 
 
 
 
 
 
 24 
 
 
 
 
 
 
 
 
 28. 
 
 
 
 
 
 
 
 
 
 
 
 3 
 
 21 
 
 
 
 
 28. 
 
 
 
 
 
 
 
 
 
 24 
 
 
 
 
 
 (1 
 
 
 29. 
 
 
 
 
 
 
 
 
 
 U 15 
 
 9 
 
 
 
 
 
 
 
 
 
 
 
 
 30. 
 
 Vane 
 
 clogged 
 
 by ice. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 81. 
 
 
 
 
 2 
 
 12 
 
 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Sinne. 
 
 71 
 
 23 
 
 18 
 
 182 
 
 120 
 
 140 
 
 112 
 
 42 
 
 
 
 Sunm. 
 
 49 
 
 89 
 
 133 
 
 120 
 
 ITIi 
 
 40 
 
 55 
 
 '.I 
 
 1 
 
 Date. 
 
 S. E. 
 
 s. 
 
 s.w. 
 
 W, 
 
 N. W. 
 
 N. 
 
 N. E 
 
 E. 
 
 Calm. 
 
 Date. 
 
 S. E. 
 
 8. 
 
 S.W. 
 
 w. 
 
 N.W. 
 
 N. 
 
 N.E. 
 
 , 
 
 Calm. 
 
 1. 
 
 
 
 
 
 
 
 3 
 
 21 
 
 
 
 
 
 
 
 
 1. 
 
 
 
 17 
 
 7 
 
 
 
 
 
 
 
 
 
 
 
 
 2. 
 
 
 
 
 
 
 
 
 
 24 
 
 
 
 
 
 (1 
 
 
 2. 
 
 
 
 5 
 
 7 
 
 4 
 
 8 
 
 (I 
 
 
 
 
 
 
 3. 
 
 
 
 
 
 
 
 
 
 24 
 
 
 
 
 
 
 
 
 3. 
 
 1 
 
 
 
 (I 
 
 4 
 
 8 
 
 9 
 
 
 
 2 ' 
 
 
 4. 
 
 
 
 
 
 
 
 
 
 24 
 
 
 
 
 
 
 
 
 4. 
 
 2 
 
 
 
 
 
 
 
 1 
 
 8 
 
 8 
 
 5 
 
 
 5. 
 
 
 
 
 
 
 
 (l 
 
 24 
 
 
 
 
 
 
 
 
 5. 
 
 9 
 
 
 
 
 
 
 
 3 
 
 5 
 
 (i 
 
 1 
 
 C. 
 
 
 
 
 
 
 
 
 
 24 
 
 
 
 
 
 
 
 
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 66 
 
 95 
 
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 78 
 
 72 
 
 72 
 
 153 
 
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 (10) 
 
JTJ.TSTE. 
 
 Date. 
 
 3. E. 
 
 s. 
 
 s. w. 
 
 \v. 
 
 N. W. 
 
 N. 
 
 N. E. 
 
 !:. 
 
 OUm. 
 
 Date. 
 
 S. E. 
 
 8. 
 
 s. w. 
 
 w. 
 
 N. W. 
 
 N. 
 
 N E. 
 
 E. 
 
 Calm. 
 
 1. 
 
 5 
 
 
 
 
 
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 7 
 
 8 
 
 
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 9 
 
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 21 
 
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 11 
 
 
 
 
 
 
 
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 7 
 
 16 
 
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 12 
 
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 9 
 
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 9 
 
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 8 
 
 
 
 
 
 
 
 
 
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 8 
 
 
 
 
 
 
 
 
 
 
 
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 13 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 13 
 
 11 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 17 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 7 
 
 17 
 
 
 
 
 
 
 
 
 
 
 
 
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 12 
 
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 9 
 
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 23 
 
 
 
 
 
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 5 
 
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 19 
 
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 4 
 
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 22 
 
 
 
 
 
 
 
 
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 18 
 
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 9 
 
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 4 
 
 4 
 
 12 
 
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 7 
 
 
 
 2 
 
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 4 
 
 7 
 
 
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 5 
 
 3 
 
 1 
 
 2 
 
 6 
 
 2 
 
 3 
 
 
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 23 
 
 
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 4 
 
 6 
 
 4 
 
 10 
 
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 1 
 
 
 
 3 
 
 2 
 
 2 
 
 3 
 
 9 
 
 4 
 
 
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 21 
 
 
 
 
 
 
 
 
 
 
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 1 
 
 8 
 
 15 
 
 
 
 
 
 
 
 
 
 
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 9 
 
 13 
 
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 9 
 
 10 
 
 2 
 
 2 
 
 1 
 
 
 28. 
 
 
 
 
 
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 6 
 
 11 
 
 
 
 
 
 
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 5 
 
 
 
 1 
 
 9 
 
 8 
 
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 3 
 
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 7 
 
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 6 
 
 16 
 
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 15 
 
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 8 
 
 
 
 4 3 
 
 
 
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 Sums. 
 
 54 
 
 110 
 
 169 
 
 70 
 
 106 
 
 87 
 
 88 
 
 54 
 
 
 
 Sums. 
 
 74 
 
 103 
 
 147 
 
 103 
 
 105 
 
 45 
 
 64 
 
 79 
 
 
 
 JULY. 
 
 AUGUST 
 
 Date. 
 
 S. E. 
 
 8. 
 
 s. w. 
 
 w. 
 
 N. \V. 
 
 N. 
 
 N. E. 
 
 E. 
 
 Calm. 
 
 Date. 
 
 S. E. 
 
 s. 
 
 s w. 
 
 W. 
 
 N.W. 
 
 N. 
 
 N. E. 
 
 E. 
 
 Calm. 
 
 1. 
 
 
 
 3 
 
 5 
 
 G 
 
 4 
 
 6 
 
 
 
 
 
 
 1. 
 
 2 
 
 12 
 
 4 
 
 3 
 
 3 
 
 
 
 
 
 
 
 
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 3 
 
 19 
 
 2 
 
 
 
 
 
 
 
 
 
 
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 5 
 
 1 
 
 7 
 
 11 
 
 
 
 
 
 
 
 
 3. 
 
 4 
 
 2 
 
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 3 
 
 3 
 
 5 
 
 a 
 
 
 3. 
 
 
 
 
 
 
 
 22 
 
 2 
 
 
 
 
 
 
 
 
 4. 
 
 1 
 
 9 
 
 6 
 
 
 
 
 
 3 
 
 5 
 
 
 
 
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 14 
 
 10 
 
 
 
 
 
 
 
 
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 2 
 
 1 
 
 10 
 
 5 
 
 
 
 
 
 2 
 
 4 
 
 
 5. 
 
 
 
 1 
 
 3 
 
 9 
 
 11 
 
 
 
 
 
 
 
 
 6. 
 
 
 
 8 
 
 7 
 
 17 
 
 
 
 
 
 
 
 
 
 
 6. 
 
 
 
 10 
 
 10 
 
 3 
 
 1 
 
 
 
 
 
 
 
 
 7. 
 
 
 
 
 
 6 
 
 17 
 
 1 
 
 
 
 
 
 
 
 
 7. 
 
 1 
 
 1 
 
 
 
 3 
 
 1 
 
 2 
 
 13 
 
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 5 
 
 
 
 
 
 
 
 6 
 
 6 
 
 2 
 
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 5 
 
 2 
 
 2 
 
 11 
 
 3 
 
 
 
 
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 2 
 
 
 
 
 
 
 
 
 
 4 
 
 8 
 
 10 
 
 
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 19 
 
 5 
 
 
 
 
 
 
 
 
 
 
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 3 
 
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 6 
 
 10 
 
 
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 24 
 
 
 
 
 
 
 
 
 
 
 
 
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 2 
 
 
 
 
 
 
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 23 
 
 
 
 
 
 
 
 
 
 
 
 
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 5 
 
 
 
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 12 
 
 6 
 
 
 
 
 
 
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 11 
 
 8 
 
 2 
 
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 13. 
 
 
 
 8 
 
 6 
 
 10 
 
 
 
 
 
 
 
 
 
 
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 3 
 
 11 
 
 
 
 
 
 
 
 5 
 
 3 
 
 2 
 
 
 14. 
 
 12 
 
 2 
 
 
 
 
 
 
 
 
 
 
 
 10 
 
 
 14. 
 
 
 
 8 
 
 6 
 
 4 
 
 4 
 
 2 
 
 
 
 
 
 
 15. 
 
 3 
 
 14 
 
 
 
 
 
 
 
 
 
 1 
 
 6 
 
 
 15. 
 
 
 
 
 
 
 
 1 
 
 19 
 
 4 
 
 
 
 
 
 
 16. 
 
 
 
 22 
 
 2 
 
 
 
 
 
 
 
 
 
 
 
 
 16. 
 
 2 
 
 16 
 
 
 
 3 
 
 1 
 
 2 
 
 
 
 
 
 
 17. 
 
 
 
 15 
 
 9 
 
 
 
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 17. 
 
 4 
 
 2 
 
 3 
 
 3 
 
 1 
 
 3 
 
 4 
 
 4 
 
 
 18. 
 
 1 
 
 11 
 
 11 
 
 1 
 
 
 
 
 
 
 
 
 
 
 18. 
 
 4 
 
 8 
 
 
 
 
 
 
 
 2 
 
 8 
 
 4 
 
 
 19. 
 
 
 
 2 
 
 4 
 
 16 
 
 2 
 
 
 
 
 
 
 
 
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 1 
 
 5 
 
 11 
 
 1 
 
 1 
 
 2 
 
 
 
 3 
 
 
 20. 
 
 
 
 
 
 
 
 3 
 
 17 
 
 4 
 
 
 
 
 
 
 20. 
 
 13 
 
 7 
 
 1 
 
 2 
 
 1 
 
 
 
 
 
 
 
 
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 2 
 
 9 
 
 2 
 
 
 
 5 
 
 4 
 
 1 
 
 1 
 
 
 21. 
 
 12 
 
 4 
 
 3 
 
 5 
 
 
 
 
 
 
 
 
 
 
 22. 
 
 
 
 
 
 4 
 
 16 
 
 
 
 3 
 
 1 
 
 
 
 
 22. 
 
 3 
 
 
 
 
 
 1 
 
 4 
 
 15 
 
 1 
 
 
 23. 
 
 1 
 
 
 
 1 
 
 1 
 
 2 
 
 8 
 
 10 
 
 1 
 
 
 23. 
 
 
 
 7 5 
 
 3 
 
 9 
 
 
 
 
 
 
 
 
 24. 
 
 
 
 , 
 
 19 
 
 3 
 
 2 
 
 
 
 
 
 
 24. 
 
 1 
 
 7 
 
 11 
 
 5 
 
 
 
 
 
 
 
 
 
 
 25. 
 
 
 
 5 
 
 13 
 
 6 
 
 
 
 
 
 
 
 
 
 
 25. 
 
 
 
 1 
 
 
 
 
 
 
 
 7 
 
 16 
 
 
 
 
 96. 
 
 
 
 11 
 
 13 
 
 
 
 
 
 
 
 
 
 
 
 
 26. 
 
 
 
 
 
 I) 
 
 12 
 
 5 
 
 5 
 
 2 
 
 
 
 
 27. 
 
 o 
 
 9 
 
 13 
 
 2 
 
 
 
 
 
 
 
 
 
 
 27. 
 
 
 
 
 
 6 
 
 9 
 
 8 
 
 1 
 
 
 
 
 
 
 28. 
 
 5 
 
 3 
 
 2 
 
 3 
 
 4 
 
 3 
 
 2 
 
 2 
 
 
 28. 
 
 1 
 
 4 
 
 6 
 
 7 
 
 4 
 
 1 
 
 
 
 1 
 
 
 29. 
 
 
 
 1 
 
 20 
 
 3 
 
 
 
 
 
 
 
 
 
 
 29. 
 
 1 
 
 
 
 
 
 4 
 
 1 
 
 1 
 
 12 
 
 5 
 
 
 30. 
 
 
 
 2 
 
 19 
 
 3 
 
 
 
 
 
 
 
 
 
 
 30. 
 
 3 
 
 5 
 
 
 
 
 
 1 
 
 3 
 
 3 
 
 9 
 
 
 31. 
 
 
 
 6 
 
 8 
 
 2 
 
 4 
 
 4 
 
 
 
 
 
 
 31. 
 
 
 
 15 
 
 
 
 2 
 
 1 
 
 6 
 
 
 
 
 
 
 Sums. 
 
 40 
 
 148 
 
 191 
 
 144 
 
 66 
 
 61 
 
 43 
 
 51 
 
 
 
 Sums. 
 
 51 
 
 131 
 
 144 
 
 140 
 
 KM; 
 
 63 
 
 77 
 
 32 
 
 
 
 (11) 
 
SEPTEMBER. 
 
 OCTOBER 
 
 Date. 
 
 S.E. 
 
 8. 
 
 8. W. 
 
 w. 
 
 N. W. 
 
 N. 
 
 N. E. 
 
 E. 
 
 Calm. 
 
 Date. 
 
 S.E. 
 
 s. 
 
 s. w. 
 
 w. 
 
 N. \V. 
 
 N. 
 
 N. E. 
 
 E. 
 
 Calm. 
 
 1. 
 
 
 
 
 
 
 
 
 
 15 
 
 7 
 
 2 
 
 
 
 
 1. 
 
 
 
 
 
 a 
 
 15 
 
 
 
 
 
 ft 
 
 
 
 
 2. 
 
 2 
 
 2 
 
 2 
 
 2 
 
 2 
 
 4 
 
 8 
 
 2 
 
 
 2. 
 
 
 
 
 
 
 
 23 
 
 1 
 
 
 
 
 
 
 
 
 8. 
 
 
 
 
 
 
 
 3 
 
 2 
 
 3 
 
 13 
 
 3 
 
 
 8. 
 
 
 
 1 
 
 8 
 
 9 
 
 ft 
 
 4 
 
 2 
 
 
 
 
 4. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 13 
 
 11 
 
 
 4. 
 
 
 
 
 
 23 
 
 1 
 
 
 
 ft 
 
 
 
 
 5. 
 
 6 
 
 
 
 
 
 
 
 
 
 
 
 11 
 
 7 
 
 
 5. 
 
 4 
 
 
 
 
 
 2 
 
 2 
 
 1 
 
 11 
 
 4 
 
 
 6. 
 
 19 
 
 4 
 
 
 
 
 
 
 
 
 
 
 
 1 
 
 
 0. 
 
 
 
 1 
 
 
 
 
 
 1 
 
 g 
 
 6 
 
 7 
 
 
 7. 
 
 
 
 5 
 
 10 
 
 3 
 
 
 
 
 
 
 
 
 
 
 7. 
 
 
 
 
 
 
 
 
 
 
 
 3 
 
 21 
 
 
 
 
 8. 
 
 
 
 
 
 22 
 
 2 
 
 
 
 
 
 
 
 
 
 
 8. 
 
 2 
 
 (i 
 
 7 
 
 
 
 
 
 3 
 
 & 
 
 
 
 
 9. 
 
 
 
 9 
 
 Ifi 
 
 
 
 
 
 
 
 
 
 
 
 
 9. 
 
 
 
 
 
 
 
 12 
 
 12 
 
 ft 
 
 
 
 
 
 
 10. 
 
 4 
 
 
 
 
 
 2 
 
 
 
 
 
 9 
 
 3 
 
 
 10. 
 
 4 
 
 2 
 
 1 
 
 
 
 1 
 
 5 
 
 9 
 
 2 
 
 
 11. 
 
 
 
 
 
 7 
 
 5 
 
 12 
 
 
 
 
 
 
 
 
 11. 
 
 
 
 4 
 
 20 
 
 
 
 ft 
 
 
 
 
 
 
 
 
 12. 
 
 3 
 
 14 
 
 2 
 
 
 
 5 
 
 
 
 
 
 
 
 
 12. 
 
 
 
 
 
 
 
 15 
 
 3 
 
 
 
 
 
 
 
 
 13. 
 
 
 
 
 
 
 
 13 
 
 11 
 
 
 
 
 
 
 
 
 13. 
 
 
 
 
 
 
 
 
 
 3 
 
 
 
 14 
 
 7 
 
 
 14. 
 
 
 
 19 
 
 6 
 
 
 
 
 
 
 
 
 
 
 
 
 14. 
 
 10 
 
 8 
 
 
 
 
 
 ft 
 
 
 
 
 
 6 
 
 
 15. 
 
 
 
 2 
 
 3 
 
 2 
 
 2 
 
 
 
 7 
 
 8 
 
 
 15. 
 
 
 
 8 
 
 2 
 
 14 
 
 
 
 
 
 
 
 
 
 
 16. 
 
 6 
 
 
 
 
 
 
 
 
 
 
 
 3 . 
 
 15 
 
 
 16. 
 
 
 
 
 
 
 
 
 
 24 
 
 
 
 
 
 
 
 
 IT. 
 
 
 
 10 
 
 13 
 
 1 
 
 
 
 
 
 
 
 
 
 
 17. 
 
 
 
 5 
 
 9 
 
 1 
 
 9 
 
 ft 
 
 
 
 
 
 
 18. 
 
 
 
 
 
 2 
 
 2 
 
 13 
 
 4 
 
 2 
 
 1 
 
 
 18. 
 
 
 
 3 
 
 5 
 
 ft 
 
 2 
 
 3 
 
 2 
 
 9 
 
 
 19. 
 
 7 
 
 10 
 
 4 
 
 
 
 
 
 
 
 1 
 
 2 
 
 
 19. 
 
 4 
 
 2 
 
 
 
 
 
 
 
 
 
 7 
 
 11 
 
 
 20. 
 
 
 
 
 
 2 
 
 11 
 
 11 
 
 
 
 
 
 
 
 
 20. 
 
 
 
 5 
 
 19 
 
 
 
 
 
 
 
 
 
 
 
 
 21. 
 
 
 
 
 
 
 
 22 
 
 1 
 
 1 
 
 
 
 
 
 
 21. 
 
 
 
 
 
 12 
 
 8 
 
 9 
 
 
 
 
 
 
 
 
 22. 
 
 
 
 3 
 
 3 
 
 4 
 
 8 
 
 
 
 
 
 
 
 
 22. 
 
 
 
 
 
 13 
 
 7 
 
 4 
 
 
 
 
 
 
 
 
 23. 
 
 5 
 
 4 
 
 3 
 
 
 
 
 
 3 
 
 5 
 
 4 
 
 
 23. 
 
 
 
 
 
 
 
 4 
 
 5 
 
 11 
 
 4 
 
 
 
 
 24. 
 
 
 
 
 
 
 
 11 
 
 8 
 
 5 
 
 
 
 
 
 
 24. 
 
 3 
 
 1 
 
 
 
 
 
 
 
 2 
 
 8 
 
 10 
 
 
 25. 
 
 5 
 
 2 
 
 
 
 
 
 2 
 
 1 
 
 9 
 
 5 
 
 
 25. 
 
 1 
 
 11 
 
 12 
 
 
 
 
 
 
 
 
 
 
 
 
 20. 
 
 
 
 7 
 
 17 
 
 
 
 
 
 
 
 ' 
 
 
 
 
 20. 
 
 
 
 
 
 1 
 
 7 
 
 1 
 
 2 i 11 
 
 2 
 
 
 27. 
 
 
 
 
 
 2 
 
 11 
 
 4 
 
 
 
 1 
 
 6 
 
 
 27. 
 
 
 
 
 
 
 
 
 
 (1 
 
 
 
 13 
 
 11 
 
 
 28. 
 
 10 
 
 5 
 
 1 
 
 
 
 2 
 
 
 
 
 
 6 
 
 
 28. 
 
 
 
 
 
 
 
 
 
 ft 
 
 10 
 
 14 
 
 
 
 
 29. 
 
 
 
 3 
 
 3 
 
 1 
 
 15 
 
 2 
 
 
 
 
 
 
 29. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 24 
 
 
 
 
 30. 
 
 
 
 
 
 
 
 
 
 2 
 
 7 
 
 
 
 9 
 
 
 30. 
 
 
 
 
 
 
 
 
 
 
 
 9 
 
 15 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 31. 
 
 
 
 
 
 
 
 
 
 
 
 7 
 
 10 
 
 7 
 
 
 Sums. 
 
 07 
 
 99 
 
 122 
 
 95 
 
 115 
 
 49 
 
 90 
 
 83 
 
 
 
 Sums. 
 
 28 
 
 57 
 
 141 
 
 113 
 
 83 
 
 08 
 
 177 
 
 70 
 
 ft 
 
 NOVEMBER. 
 
 DECEMBER. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Date. 
 
 S. K. 
 
 s 
 
 8. W. 
 
 w. 
 
 N. W. 
 
 N. 
 
 N. E. 
 
 E. 
 
 Calm. 
 
 Date. 
 
 S.E 
 
 s. 
 
 s. w. 
 
 w. 
 
 N. W. 
 
 N. 
 
 N E. 
 
 E. 
 
 Calm. 
 
 1. 
 
 2 
 
 
 
 
 
 1 
 
 7 
 
 14 
 
 
 
 
 
 
 1. 
 
 2 
 
 1 
 
 
 
 15 
 
 
 
 
 
 
 
 
 
 
 2. 
 
 4 
 
 3 
 
 
 
 
 
 
 
 11 
 
 4 
 
 2 
 
 
 2. 
 
 
 
 3 
 
 5 
 
 16 
 
 
 
 
 
 
 
 
 
 
 3. 
 
 
 
 24 
 
 
 
 ft 
 
 
 
 
 
 
 
 
 
 
 3. 
 
 
 
 
 
 
 
 20 
 
 4 
 
 
 
 
 
 
 
 
 4. 
 
 
 
 8 
 
 1 
 
 3 
 
 12 
 
 
 
 
 
 
 
 
 4. 
 
 
 
 
 
 
 
 2 
 
 22 
 
 
 
 
 
 
 
 
 5. 
 
 2 
 
 13 
 
 3 
 
 3 
 
 3 
 
 
 
 
 
 
 
 
 5. 
 
 
 
 
 
 
 
 
 
 
 
 24 
 
 
 
 
 
 
 6. 
 
 
 
 38 
 
 5 
 
 
 
 
 
 
 
 
 
 
 
 
 6. 
 
 
 
 
 
 
 
 
 
 
 
 10 
 
 8 
 
 
 
 
 7. 
 
 2 
 
 5 
 
 2 
 
 15 
 
 
 
 
 
 
 
 
 
 
 7. 
 
 
 
 
 
 
 
 
 
 
 
 17 
 
 7 
 
 
 
 
 8. 
 
 
 
 ft 
 
 
 
 24 
 
 
 
 
 
 
 
 
 
 
 8. 
 
 
 
 
 
 
 
 1C 
 
 7 
 
 1 
 
 
 
 
 
 
 9. 
 
 
 
 
 
 9 
 
 15 
 
 
 
 
 
 
 
 
 
 
 9. 
 
 
 
 
 
 
 
 12 
 
 9 
 
 1 
 
 2 
 
 
 
 
 10. 
 
 1 
 
 1 
 
 15 
 
 4 
 
 1 
 
 
 
 
 
 2 
 
 
 10. 
 
 1 
 
 3 
 
 15 
 
 
 
 
 
 
 
 4 
 
 1 
 
 
 11. 
 
 
 
 
 
 2 
 
 19 
 
 i 
 
 
 
 
 
 
 
 
 11. 
 
 
 
 
 
 6 
 
 12 
 
 5 
 
 1 
 
 
 
 
 
 
 12. 
 
 
 
 
 
 ft 
 
 2 
 
 f 
 
 3 
 
 2 
 
 8 
 
 
 12. 
 
 
 
 
 
 
 
 
 
 1 
 
 3 
 
 7 
 
 13 
 
 
 13. 
 
 
 
 
 
 
 
 4 
 
 5 
 
 6 
 
 6 
 
 5 
 
 
 18. 
 
 
 
 
 
 1 
 
 
 
 1 
 
 7 
 
 14 
 
 1 
 
 
 14. 
 
 
 
 
 
 
 
 23 
 
 1 
 
 
 
 
 
 
 
 
 14. 
 
 
 
 
 
 4 
 
 20 
 
 
 
 
 
 
 
 
 
 
 15. 
 
 
 
 
 
 
 
 20 
 
 4 
 
 
 
 
 
 
 
 
 15. 
 
 
 
 
 
 10 
 
 1 
 
 3 
 
 3 
 
 1 
 
 
 
 
 16. 
 
 
 
 
 
 
 
 4 
 
 19 
 
 1 
 
 
 
 
 
 
 16. 
 
 
 
 
 
 
 
 2 
 
 10 
 
 12 
 
 
 
 
 
 
 17. 
 
 5 
 
 10 
 
 3 
 
 
 
 
 
 
 
 
 
 
 
 
 17. 
 
 
 
 
 
 14 
 
 10 
 
 
 
 
 
 
 
 
 
 
 18. 
 
 
 
 14 
 
 3 
 
 7 
 
 
 
 
 
 
 
 
 
 
 18. 
 
 3 
 
 4 
 
 10 
 
 1 
 
 
 
 
 
 
 
 
 
 
 19. 
 
 
 
 
 
 5 
 
 19 
 
 
 
 
 
 
 
 
 
 
 19. 
 
 
 
 
 
 12 
 
 9 
 
 3 
 
 
 
 
 
 
 
 
 20. 
 
 
 
 
 
 5 
 
 18 
 
 1 
 
 
 
 
 
 
 
 
 20. 
 
 
 
 
 
 
 
 
 
 22 
 
 2 
 
 
 
 
 
 
 21. 
 
 
 
 
 
 
 
 21 
 
 3 
 
 
 
 
 
 o- 
 
 
 21. 
 
 
 
 
 
 14 
 
 4 
 
 
 
 
 
 
 
 
 
 
 22. 
 
 
 
 
 
 
 
 3 
 
 15 
 
 1 
 
 3 
 
 2 
 
 
 22. 
 
 
 
 3 
 
 8 
 
 10 
 
 3 
 
 
 
 
 
 
 
 
 23. 
 
 13 
 
 3 
 
 7 
 
 
 
 
 
 
 
 
 
 1 
 
 
 23. 
 
 8 
 
 2 
 
 
 
 
 
 1 
 
 8 
 
 4 
 
 1 
 
 
 24. 
 
 
 
 
 
 
 
 9 
 
 9 
 
 
 
 
 
 
 
 
 24. 
 
 8 
 
 16 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 25. 
 
 3 
 
 
 
 1 
 
 
 
 7 
 
 
 
 1 
 
 
 
 
 25. 
 
 
 
 2 
 
 1 
 
 1 
 
 20 
 
 
 
 
 
 
 
 
 26. 
 
 
 
 
 
 1 
 
 23 
 
 
 
 
 
 
 
 
 
 
 20. 
 
 
 
 
 
 
 
 
 
 
 
 18 
 
 
 
 
 
 
 27. 
 
 
 
 
 
 :; 
 
 19 
 
 2 
 
 
 
 ft 
 
 
 
 
 27. 
 
 
 
 3 
 
 4 
 
 8 
 
 5 
 
 4 
 
 
 
 
 
 
 28. 
 
 
 
 2 
 
 10 
 
 
 
 ft 
 
 ft 
 
 
 
 
 
 
 28. 
 
 
 
 
 
 
 
 20 
 
 4 
 
 
 
 
 
 
 
 
 29. 
 
 4 
 
 17 
 
 3 
 
 
 
 
 
 
 
 
 
 
 
 
 29. 
 
 
 
 
 
 
 
 9 
 
 8 
 
 7 
 
 
 
 
 
 
 30. 
 
 1 
 
 1 
 
 5 
 
 2 
 
 
 
 2 
 
 7 
 
 6 
 
 
 30. 
 
 
 
 
 
 
 
 
 
 
 
 24 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 31. 
 
 
 
 
 
 
 
 
 
 
 
 12 
 
 12 
 
 
 
 
 Hums. 
 
 43 
 
 120 
 
 95 
 
 270 
 
 99 
 
 38 
 
 23 
 
 32 
 
 
 
 Sums. 
 
 22 
 
 43 
 
 110 
 
 188 
 
 134 
 
 100 
 
 65 
 
 10 
 
 
 
 (12) 
 
SUMMARY. 
 
 Month. 
 
 8. E. 
 
 S. 
 
 8. W. 
 
 w. 
 
 N. W. 
 
 N. 
 
 N. E. 
 
 E. 
 
 Calm. 
 
 January (30 (lays) 
 
 71 
 
 23 
 
 18 
 
 182 
 
 120 
 
 140 
 
 110 
 
 49 
 
 
 February 
 
 49 
 
 88 
 
 133 
 
 120 
 
 176 
 
 40 
 
 RK 
 
 
 
 March 
 
 05 
 
 78 
 
 53 
 
 100 
 
 70 
 
 P.9 
 
 KQ 
 
 ro 
 
 
 April 
 
 56 
 
 05 
 
 93 
 
 78 
 
 72 
 
 79 
 
 1 KQ 
 
 1 AA 
 
 
 May 
 
 54 
 
 116 
 
 169 
 
 70 
 
 100 
 
 S7 
 
 CO 
 
 CA 
 
 
 
 74 
 
 103 
 
 147 
 
 103 
 
 10"! 
 
 AK 
 
 (*A 
 
 7O 
 
 
 July 
 
 40 
 
 148 
 
 191 
 
 144 
 
 66 
 
 fil 
 
 jffi 
 
 ri 
 
 
 August 
 
 51 
 
 131 
 
 144 
 
 140 
 
 100 
 
 fts 
 
 77 
 
 
 
 September 
 
 07 
 
 00 
 
 122 
 
 95 
 
 115 
 
 49 
 
 on 
 
 83 
 
 
 October 
 
 28 
 
 57 
 
 141 
 
 113 
 
 QQ 
 
 no 
 
 177 
 
 76 
 
 
 
 43 
 
 120 
 
 95 
 
 "70 
 
 on 
 
 38 
 
 
 QO 
 
 
 December 
 
 22 
 
 43 
 
 110 
 
 188 
 
 134 
 
 ififi 
 
 fi* 
 
 1 fi 
 
 
 
 
 
 
 
 
 
 
 
 
 Year 
 
 620 
 
 1 102 
 
 1 422 
 
 1 <;<:: 
 
 1 4.^ 
 
 1Q9 
 
 1 AA'"^ 
 
 /.on 
 
 
 
 
 
 
 
 
 
 
 
 
 (13) 
 
HOURLY MEASURES IN MILES 
 
 OF THE 
 
 HORIZONTAL MOVEMENT OF THE WIND 
 
 FOB 
 
 EACH DAY, MONTH, AND THE YEAR 1886, 
 
 AS DEBITED FROM THE RECORDS OF THE DRAPER ANEMOMETER. 
 
PH 
 
 S 
 ^ 
 
 I 
 
 J 
 
 10 
 
 1 
 
 CNO2rHO5rHC 
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 (NCOOi 
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 CN CM'CN CN CO (N 
 
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 CqrHrHCOCMCNCNrHCOtN 
 
 Tj<Tj(rHOt-CNrt<CafM<M 
 5q rH rH CO rH CN CN * CO 
 
 rH S O ^< Oi L~ h- * O 1^ 
 
 COrHrHCNrHCNCNrHCOCO 
 
 COrHrHrHCNCNCOrHrH'i' 
 
 COrH rH 
 
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 COCNCOrH 
 
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 r'rHrHCNCOrHCNrHtOCO 
 
 CCOrHOOrHCOCO'OCC'* 
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 COCMrHrH-^rHCNrHiOCO 
 
 l^lOlO^CSCOOrH 
 rHr-C^rHCNrHOCO 
 
 fOt-COCCOl IOCOOO 
 COrHrHrH-ilrHCNrHIOCO 
 
 rHrHrHrHCOCNCNCNCOCN 
 
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 g 
 
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 i-H rH rH CM CN CM rH CN 
 
 CO 
 CD 
 ii 
 
 lOi-H-^CMCOCOOOOCN 
 rHCNrHCN CMrHCN CN 
 
 
 10 
 rH 
 
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 CO 
 
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 1- 
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 O 
 
 
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 S 
 
 
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 CN (M CM (M <M CM Ol ON CM CO CC 
 
 5 
 
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 CO rH CO ^"^ CC CO 33 
 C 1 ) 03 Tf 1 33 CC rH CO 
 
 CO 
 
 co" 
 
 CDOOTK 
 
 C!5 
 rH 
 
 O O 'O 00 O ffi 'O 
 rH i-H CM CM CN i-H CM 
 
 S 
 
 1O CM * Ol CM CO * 
 
 rH T-H CM CM CM rH CM 
 
 l-H 
 
 CM CO CN CO rH OD CO 
 rH rH CM CM CN rH CM 
 
 'O 
 rH 
 
 CM OCM O OrH CN 
 i-H CM CM CO i-H CM CM 
 
 CM 
 
 S 
 
 l-H 
 
 SS8S81S 
 
 rH 
 
 t~ CM --O CC CM CM -* 
 OJ CM CM i-H rH CM 
 
 2 
 
 1- CO IS O Tl CO MS 
 rH CM ^) CM rH rH CM 
 
 S 
 
 1O CO CM CO O L- OS 
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 1 
 
 O 1O CO CO C5 CO Th 
 CM CN COCM CM 
 
 rH 
 
 "O CM <M CO C35 CC O 
 CM CM * CM CM 
 
 S 
 
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 CM CM COCM CM 
 
 2 
 
 O5 CM i-H O O 1O CO 
 rHCM COCM rH CM 
 
 CO 
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 CO -* 00 O rH ^ rH 
 CM CM COCM rH CM 
 
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 "* >O CM Ol CM L~ * 
 CM CTJ CO CN rH CM 
 
 CD 
 
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 1C rH CM Ol rd CO OS 
 CM CM CO rH rH rH rH 
 
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 CM rH CM CM CM rH rH 
 
 CO 
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 CM O5 rH I'- 1O 'O CM "" 
 
 rH i-H CN CM CM rH CM |? 
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 rH t^ rH O O CC CM 
 1-HCMrHCOCMrHCM g 
 
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 fN 
 
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 | 
 
 1 rH O CD CO CO i-H S 
 CO rH CM CN l-H CM -tj 
 
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 CNCMCNCNCNCNCMCNCMTOCO 
 
 
 - 
 
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 Means. 
 
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 CO 
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 CM 
 
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 rH 
 
 'M 
 
 rH 
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 O 
 SI 
 
 o 
 
 CM 
 
 CM 
 
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 CD 
 
 c-. 
 
 CN 
 
 CM 
 
 rH 
 
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 T-H 
 
 > . 
 
 l| 
 
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I 
 
 o 
 
 2 
 
 OCOCO 
 CO CO r- 1 
 
 OS rH GO 00 O5 CM O IN O <* 
 r-l CM rH CM CM rH <?] CM 
 
 COCDlOC5COrHCO;OiOO 
 rH rH rH CM CM rH CM CM 
 
 CD 00 -^ < ".1 CO CD 1C 71 ;< 
 r-l t-H rH CO CO <N CM 
 
 !C 1C -* CT C O e '-O CN S^ 
 
 -H -H ,-H CO CO i-H !M CO 
 
 cMiococo-^cot 
 
 rH 05 CO <N 
 
 t^ rH 
 
 COCC 
 
 CO5D 
 rH CT 
 
 rH 05 05 i-H CO (N 
 
 rHCOrHCOCOrH 
 
 GOOCO5 
 CM <M 
 
 CSCNCOOC-^OCOOTOrH 
 rH CO rH CO CO rH CO rH (M 
 
 t^C^O 
 CMrHC-1 
 
 rHi-HO 
 CO <N * 
 
 CM (M rH C-l rH (M 
 
 OOCOCCCOCOCOCCOCOO 
 rHCOrHCOCOSMrHrHOlrH 
 
 rHaS^SOCOO 
 T-KMIMCOCOtN 
 
 rHlO5O"OSMrHQ05OO 
 (NfiSIC<5CO(NrHi-H(N<M 
 
 E 
 1 
 
 OJ 
 
 rH 
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 s 
 
 
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 QQ 
 
 
 A 
 
 T ( <T1 ?C ^ O CD t-- CO C5 O 
 
 & 
 
 
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 t-SS&'tO^f-iU'CTHaD 
 
 rH 
 
 co 
 
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 i 
 
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 i - 
 
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 cn 
 
 IN 
 
 CD t- r- "M CO iM fM IO CM CO 
 
 SO rH IT-1 ^1 CO CO T-l rH Ta 1O 
 
 i 
 
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 COrHCOCMCOCOfMi-H'MMH 
 
 g 
 7-1 
 
 CC '00 Ol CO O O 'N CO rH Ci 
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 ^ 
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 OOOCfiCTCOh-t COCOt^ 
 COrHrHfMCOGMrH'MCOCO 
 
 S 
 
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 t-a2CDC5CO5Ot^rHCO^ 
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 tCOOCOCOt-rHCOrHt-IM 
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 rH 
 & 
 
 COCOCOOOCO5001O-HHIO 
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 CO rH CO GM <M SM SM C-l 
 
 CO 
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 05OO5l~(NOOrH<N<N 
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 rH 
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 occosr^rHoso 1CO-* 
 
 rf\ rH CO (N rH IN rH Ol CM IN 
 
 rH 
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 rHCOOCCQOClCCOOrHrH 
 COGM'*'NrH-NrHrH<N<N' 
 
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 CO 
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 OOCOOOSOO^NINlOrH 
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 t- I- CO CM I GO C5 CR 
 
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 (17) 
 
 Monthly 
 
 Sums. 
 
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 September. 
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 Annual Sum 
 
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 (28) 
 
HOURLY VALUES IN INCHES OF MERCURY 
 
 [REDUCED TO 32 FAHRENHEIT] 
 
 OF TIIK 
 
 ATMOSPHERIC PRESSURE, 
 
 FOR 
 
 EACH DAY, MONTH, AND THE YEAR 1886, 
 
 AS DERIVED FROM THE RECORDS OF THE DRAPER BAROGRAPH. 
 
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 (42) 
 
TRACINGS 
 
 FROM TIIK 
 
 SELF-RECORDING INSTRUMENTS, 
 
 TO LLLUSTKATE CKUTAIN 
 
 METEOROLOGICAL PHENOMENA 
 
 DURING THE 
 
 YEAR 1886. 
 
THE tracings on Plates Nos. 1 and 1 A show the barometer corrected to 32 Fahrenheit. This correction 
 is made automatically by the barograph. Plates Nos. 4 and 5 give the relative humidities in percentages 
 of saturation. 
 
 Curve 1, Plate No. 1 A, shows the barograph trace on Jan. 9, during a remarkable cyclonic storm 
 which, moving northeastward along the Atlantic coast, apparently passed centrally over this station, and the 
 barometer reached the lowest point yet recorded. Plate No. (! shows the tracing of the Draper anemograph 
 on this day. The lull in the wind in the middle of the day was coincident with or immediately preceded 
 the passage of the cyclone centre, as well as can be determined from synoptic charts ; but this lull preceded 
 the occurrence of the minimum pressure recorded at this station by nearly two hours. Plate No. 7 shows the 
 changes in wind direction during this cyclone. The sinuous line on this plate was traced through the centre 
 of the oscillations of the wind vane, as shown on the original anemoscope sheet. (The vane is never steady 
 during high winds, but continuously oscillates, first to one side, then to the other, making a broad trace on the 
 anemoscope sheet.) The results of a special study of this cyclone are given by Prof. Upton in the American 
 Meteorological Journal, Vol. III., No. 8. 
 
 Curve 2, Plate No. 1, shows the tracing of the barograph on the morning of Feb. 27, during one of the 
 severest gales on record. The -sharp depression at 10.20 A. M. was coincident with the opening of a trap door 
 in the top of the tower, and the other less marked sharp depressions were noted by the observer as being 
 coincident with severe gusts of wind. The pressure gauge shows the pressure during some of the gusts to 
 have been over forty pounds per square foot, which is equivalent to a velocity of about 90 miles per hour. 
 The total wind movement for the day was 1,467 miles. The barograph tracing is but a sample of what 
 occurred in a less marked degree during all of the severe gales of the year. (For further information, see 
 Science, Vol. VIII., page 325.) 
 
 Curve 3, Plate No. 1 A, shows the barograph trace during four hours, ending at 3 A. M., of March 22. 
 There was also a slight upward swell of the temperature curve during these hours. An inappreciable quantity 
 of snow fell, and bright Hashes of lightning were seen about 1 A. M., but no thunder was heard. Severe thunder- 
 storms were, however, reported from distant points on this night. The wind suddenly backed for a brief interval 
 from northeast to west at 12.15 A. M., then, returning to northeast, slowly backed during the night to west. A 
 decided decrease in wind velocity between 12.30 and 2 A. M. accompanied the rise in pressure. 
 
 Curves 1, Plates Nos. 2 and 4, show tracings of the thermograph and self-recording hygrometer, respec- 
 tively, from 10 A. M. to 12 M. of April 7. The sudden rise in temperature and fall in humidity at 11.20 A. M. 
 was coincident with a brief clearing of the sky near the zenith and the appearance of the sun, the observatory 
 during the rest of the day being enveloped in a dense fog. Accompanying these phenomena, there was a sudden 
 shift of the wind from southwest to north. Similar appearances of sunshine during the year did not produce 
 similar effects on the temperature and humidity, and it is suggested that in this case the phemomena may 
 have arisen from a brief, local descending current of air. 
 
 Curves 2, Plates Nos. 2 and 4, show the sudden fall of temperature and sudden rise of humidity which 
 accompanied a thunder-storm between 4.45 and 6.20 P. M. of May 5. There was also a slight rise of the baro- 
 graph curve. The wind suddenly shifted from south to northwest at 4.45 P. M., after which it slowly backed 
 again to south. No noticeable change in wind velocity occurred. Rain fell from 4.45 to 8.40 P. M., and amounted 
 to 0.42 inch. Curve 1, Plate No. 8, shows the tracing of the self-recording rain gauge during the time. 
 
 Curves 4, Plate No. 1 A, 3, Plates Nos. 2 and 4, show the tracings of the barograph, thermograph, and 
 hygrometer, respectively, between 3 and 6 A. M. of May 31. Thunder was first heard on this morning about 
 3 A. M. Eain began at 4.15, and ended at 5.20 A. M., and 0.35 inch fell. Curve 2, Plate No. 8, shows the 
 tracing of the self-recording rain gauge. The wind suddenly shifted from west to north at 3.30 A. M., then 
 returned to west at 4 A. M., but again shifted to north at 5 A. M. The wind velocity decreased both before and 
 after the storm, but blew with a velocity of about twenty-five miles per hour from the north during the storm. 
 
 Curves 4, Plates Nos. 2 and 4, show the tracings of the thermograph and hygrometer on June 10 between 
 7 and 10 P. M., during which time a light thunder-shower passed over the observatory. The clouds attending 
 this shower were broken and not well developed. There was an outspreading top, but no cirrus fringe. About 
 0.10 inch of rain fell, most of which came in a sudden down-pour between 8.5 and 8.10 p. M. See curve 3, 
 Plate No. 9. During the storm the wind veered from northeast to southwest, and there was an increase in 
 velocity at 7.55 p. M., lasting about five minutes. Thunder was not heard until the rain had nearly ceased, but 
 continued for about half an hour as the storm passed to the east, apparently increasing in intensity. 
 
 Curve 5, Plate No. 1, shows the tracing of the barograph between 2 and 4 A. M., July 30, during which 
 time a thunder-storm passed over the observatory, attended by a most brilliant and almost continuous display of 
 
 (44) 
 
lightning and loud thunder. Several houses in the neighboring towns were set on fire by the lightning. 0.10 
 inch of rain fell ; most of it, as shown by the self-recording rain gauge in Plate No. 9, curve 4, fell between 
 2.45 and 2.50 A. M. The wind veered from southwest to northwest during the passage of the storm, and backed 
 to south after the storm passed. There was a slight decrease in wind velocity for a short while preceding and 
 following the storm, and a decided increase during its passage. Both the temperature and humidity were high, 
 and showed no marked changes during the passage of the storm. 
 
 Curves 6, Plate No. 1 A, 5 (dotted), Plate No. 2, and 5, Plate No. 5, show the tracings of the barograph, 
 thermograph, and hygrometer, between 3 and 6 p. M. of Aug. 12. A thunder-storm passed over the observatory 
 immediately after 4 p. M., attended by a heavy shower of rain and a little hail. Almost the whole of the rain 
 (0.42 inch) fell in a rapid down-pour, lasting from 4.05 to 4.25 P. M. See tracing of the self-recording gauge, 
 curve 5, Plate No. 9. The wind oscillated between north and west during the passage of the storm, and blew 
 with a decidedly increased velocity from 4.15 to 4.20 P. M. 
 
 Plate No. 3 shows some inversions of temperature between the summit and base of the hill. Curve 1 
 shows the tracing of the thermograph at the summit from noon of Aug. 22 to noon of Aug. 23. Curve 2 
 (dotted) shows the tracing of a Draper thermograph at the base, or rather on the slope of the hill, four hundred 
 feet beneath the summit. The time scale of this latter tracing is enlarged to make it correspond with the tracing 
 at the summit. It is seen that the temperature was higher at the base during the day and decidedly lower at 
 night. The temperature at the base continued to fall until sunrise of the 23d, while at the summit it rose after 
 
 11 P. M. of the 22d. This inversion occurred on an unusually clear, quiet night, and is a marked example of 
 what almost invariably occurs on such nights. (For further information see Science, Vol. VIII., pp. 233 
 and 281.)' 
 
 In a similar manner curves 3 and 4 (dotted) show the tracings of the thermographs at the summit 
 and at the base of the hill, respectively, from 11 A. M. of Nov. 17 to noon of Nov. 18. It is seen that the tem- 
 perature at the summit rose continuously, while the temperature at the base fell from 1 p. M. of the 17th to near 
 3 A. M. of the 18th, when it was 20 lower than at the summit. This was caused by the not uncommon occur- 
 rence of a flow of cold northerly winds around the base, while a strong southerly wind prevailed at the summit. 
 At 10 P. M. of the 17th the wind was blowing three miles per hour from the northwest at the Boston Signal 
 Office, which is ten miles north of Blue Hill Observatory, and about five hundred feet lower; while on Blue Hill 
 it was blowing at the rate of twenty-eight miles an hour from the south. Reports from other stations show that 
 this thin cool northerly current overspread the whole of New England, and was accompanied by a dense fog. 
 Between 3 and 4 p. M. of the 17th these two currents were fighting for the mastery at the summit of Blue Hill, 
 and its effects are seen on the thermograph curve and on the hygrometer curve, 9, Plate No. 5. During this 
 time a cool, damp, foggy current would roll in, lasting five or ten minutes ; then it would be displaced by a 
 warmer current from the south lasting about the same interval. This alternate action lasted over half an hour, 
 after which the southerly current remained permanently. 
 
 Curve 6, Plate No. 4, shows a marked example of the rapid fall in humidity which usually follows the 
 passage of a storm. Curve 6, Plate No. 2, shows the temperature during this interval. These curves are from 
 tracings of the hygrometer and thermograph from !> A. M. to 3 p. M. of Sept. 24. Curve 7, Plate No. 5, which 
 exhibits the tracing of the hygrometer from 7 A. M. to noon of Nov. 4, shows another marked example of the 
 rapid fall of humidity immediately following the passage of the line of minimum pressure in a storm. 
 
 Curves 7, Plates Nos. 1 and 2, show the tracings of the barograph and thermograph during the passage 
 of a thunder-storm on Nov. 6. Rain fell continuously from noon to 4.30 P. M. of this date, ending with a 
 thunder-storm which passed over to the east. There was a slight increase in wind velocity during the passage of 
 the storm, but no marked change in direction. 
 
 Curves 8, on Plates Nos. 1 A, 2, and 5, show the tracings of the barograph, thermograph, and hygrometer, 
 respectively, on the early morning of Nov. 7, when a thunder-storm of moderate intensity passed over the 
 observatory. The wind oscillated between southeast and southwest during the night, and slightly increased in 
 velocity for a short while about 4 A. M. Heavy rain fell from midnight to 4 A. M. 
 
 Curve 9, Plate No. 2, shows' a rapid rise in temperature which was coincident with the occurrence of the 
 time of minimum pressure in a storm which, moving northeasterly along the Atlantic coast, passed centrally over 
 this region about 9 p. M. of Nov. 25. Curve 9, Plate No. 1, shows the fall of the barometer on this date from 
 
 12 M. to 11 P. M. This curve shows small wave-like oscillations which are not uncommonly shown by the 
 barograph curve at this observatory. 
 
 Curve 10, Plate No. 1 A, gives a rather striking example of these short wave-like undulations which 
 occurred between 7 A. M. and noon of Dec. 7. The cause of these undulations is not clearly understood, since 
 they cannot be directly connected with changes of the wind velocity, or with any of the meteorological elements. 
 
 H. HELM CLAYTON. 
 
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