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 . AP ff.7 I8t 6. 1 V \ 1 X x II II V 1 1 JORDAN . ( ' u 1 1 1 . 1> 3 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 OF THE METEOROLOGICAL OBSERVATIONS MADK AT THE BLUE HILL METEOROLOGICAL OBSERVATORY, IN THE YEAR 1886. P P3 PQ > 3 i 1 i i !? CO 'O c >O * '3 5.1 3 OOOO>aiOO'O'OOOOOiOC-OlO'O>O>OOOOOOOOO l!5 O rH CO r-l * rHCT (N-^-^IOCO (MrH COCO OS ta rH rH rH rH rH M O O O O O O O O O 1OOOO1CO1OO CO 5 (N * 1OCO-* * CO C 00 CO O O O O OD CO O ^tfl 00 00 ^ 00 OS O CO 00 CO CO CO T-H CO m 5 II H O \ Q 9 i o 5? >. a X* is II .9 g-s S (2) c. cs q S 8?o S o . I oo^oooojgoooo^-coooooooooojoo^ooo o IO O O t- rH t^ l.T CO 1C CO rH IQ CO t^ OD ^ CO t~ OO CO C: O * o co co * oqp 03 1- Q5 to 53 co -* ro cc * t- 1- 05 o * o O t? ?o o * 1^. 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US CO Ol CD - gi cr> CO .t o 01 O US TH 'D 01 00 "I 'O (M S ? is (18) H PH f- I rH (71 co Tti ic cc i~ X r: o rH B CO i C5 ?$ : - i ?ilT"'r : ^ l ~Z! r- 1 EN H c: s X co o i-C 71 ~. . -* a S -. OOCOOTHCCXO^ - i rH S (71 -H (71 I- O CO 1C O 1C O (71 (71 rH rH Ol -H CO rH 2 CO 1C 71 t- 71 * l~ -f. ~. O CM Ol rH CM rH rH rH CO i-H s CC CO 1 X rH (71 CO CO I CO CO CM rH CO rH rH CM S rH 2 1C C; * O CO O X '71 O rH CCCM rH 1C . -H CO f-H 3 CO CO rH rH 1C 71 rH 71 CO 'S J CO 1C rH CO rH CM Ct CO CO CO COCOrHrHrHlOrH-HCMCO (N US -5(C rHCO CO l^ 00 C-. O 3 CC s O -r s - CO 1C rH(71CO"*lOCOt~X>35O CMCMCMCNCMCMCNCMCMCO 1 CC XCOO-^OtC-t'COOr- I i < Ol CC 1 tC Xs rH O l~ CO ^1 ^ Tf CC CO CO CC CC '^ >o i co" 00 1C CO 1- 1 rH OG t O 1-1 1 1 1 1 71 rH CO rH rH 1^ TfH rH OO-^CO-tfCOOCSXiSSlC rH rH C-1 i 1 CO rH O ^< rH CO-*!71CCC5rHt COC5CO T 1 T 1 <71 rH >1 1-H S3 i t Tuc-it^iccfto^aicsao rH rH rH i I (71 rH r*-. 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CO ^^ X CO rH rH G^ C^l G^l C^I rH rH r^ rH ft ^H rH rH "" rH rH CM rH rH CM rH rH rH 10 O ^ll f^l rH CO-*=5-OXrHt-CO^O ^H r-( CO 1-- Tt< -^ f>l C 'O t^- CO o CM1 CMCiXiOrHtDOCOrH * X r- < 4 rH rH rH ^ S OCO-T:iOrHCOrHaClO*O g rH CO rH -HH t rH CO 1O X X rH C0010=5rHr-. ^05^rH ^ TH U CO rH rH rH TH rH rH TH GO CO rH rH rH G^l t* !> G^l CO GO I O CO X t^ CNrHrHG^G^CNrHrHr- rH OOC5OCT. COO-HClrHCO rHrH CMrHrHCMrHrHrHrH CO rH ^ rH rHXC^OCOiOOOOO fc 05-. t -t-WrhrHW^ -HH O t- rH rH rH H O 1O SO O Ct O X Tfl X r: OSrHiOCSCS- i I rt rH rH rH -* 2 H H H rH rH ~ rH CO rH *"" CO CO rH *~H X O> C^ C5 t^- IO CO rH rH GO rH CO rH 3 rH rH i 1 CM rH CO rH 2? ^ cb =2 6 rH ~" rH CO rH rH CO TH rH GO rH rH CO rH CO "" "" rH 9! rH rH rH CM CM rH rH rH X "^ M rH o H (i rH rH CO rH (M X) rH rH CO rH CO r-i rH CM rH rH " CM CM " rH r-i s; ^ S S S rH rH CN rH CO t- rH rH rH rH CO rH -H rH CM CM rH rH 05 rH rH ^> ID _ ro r- rH rH " rH rH 55 rH rl TH rH rH 0 CM CM TK!5(M=5rH^O s TX10CX)OCOCTlOrHO CM O5 "5 - rH & rH ^ JS >> . 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IS i-H H H iH C: -* 1-1 SO C5 ^ O rH ^ rH rH CC rH rHrH rn 51 91 ^H H ft 6 00 Ci Tjl O 3D CC C5 O 51 O rH 51 51 r- 1 r- 51 1 o A 2 t^-t^O51L5OrHXQO^> rH CO 51 rH rH rH 9 i i 2 ^OO(NOOOCCOt-ri!C' rH 51 51 rH rH i i ^ rH 3 1 ^ "-SSS^SSSJS f CM 1 r- ffl^OWMOOCOOQO ^3 i* s 19 O^OC5Ci>-t^t^rH rH 51 (M rH 51 rH 51 g rH 15 i # rH^rHrHOCOCO^Ht^^ rH 51 51 rH 51 rH rH g rH n MCOO-i-OOGrH^t^X51 rHrH5151rHrH CO^n51 fe rH *N N TH 1C 51 51 L7 X" O ~ 51 O t- rHrH5151rH CO51rH 8 rH 0* H rHOrt(lC rHrHrH5151rHrH rHrHrH5151rHrHi-l rHrHi irH51rH51rH MOOr- oo rH !> t> Oi ^^ t~~ ^1 ^ ~H ^ CC fe rH COC-.01C10t-^t-^51M Tl rH 51 rH CD rH T*. rH t- X> rH CO t (MrHrH-C2co-^coiotoaccoso CN rHCO rH rH 1 rH CO rH r-l rH (^1 CO rH 'fl " rH Ofl rH rH <>1 rH C O O O CM T*1 O Oi CD CO rH 7-1 rH rH CC i ' rH rH Ol rH rH T1 rH rH rH rH rH rH rH OlrHi !rHrH*T-H ^O CM ^51 CO t-O,* CO CCt- 00 -* rH =OC051XrHOt-C51US^ o rH CO 51 17 O: O: CO 00 O 51 * 1C CO rH t^COUSCDCOCOXOrHCOTH rH rH 00 LC CD ^H C: CD 1C rH rH 1C CD fa rH t~ o r^ 51 o x t-- * 51 * o S rH COOCO51COO1CCO1-ICO1C ^ ' rH ^510Tj - X O5 II I & 1C CD rH 1C a 10 ^ CO * ^ =* 2 I co 51 X - 1 -H =: co ^ rH 5 t-. CO 1.7 US rH (23) PM H PQ S H H PH. H GC S Pi 1 M S IB t w 2 rHIOOlOOr- CO IS -* 3D * !N >C O t~ CO * 1O CO O * OO5t-(U5 rH CO rH (N OrH5 rH W rH rHrH rH CO (24) o US 91 CO (N CM 00 HH (7 OS CO (M rH rH CM i-H CM CT O"*THC5 (N rH rH CM 1C C5 O O Ol t- OS tO O CO (M CN rH rH tft rH rH CCC5COOOrHCC'* (M rH rH (M rH CO rH CO rH t MrH (M t~lOCOCDCDO 9 t rH r rH I 1O b- CO I >!J L CO 00 9 rH CO CJ ** -*I~ O IO CO CO CO 9 rH 3 HH O5 'N CO CO 00 CO I- OS 00 rN rH rH rH rH r-- cs n rHOCNOOCOl~O500OCO CO C-l rH rH rH rH rH 5 rH A CTO 00 5 OJ 5 US "(5 W rH rH rH rH l rH S^ rH rH i rH 5 rH CO t- "^ rH O 1 CO 1^ OS CO rHrH OlfNrHC-1 rHrH rH 2 l^ CO 1O 1- O Ol rH OS OS 'O rH rH <>l rH fM rH r-> % rH 3 USOOrHOrHlOOIOOOOt^ rH (?? O1 rH CM rH rH 9 rH 3 05CD-*O5(Ml-COCnOC.OO rH rH (71 (M rH rH 9 rH 3 OOt^-C5O5"OrH^-OSO5 rH !N rHrH l rH 9 rH ft rH COOO5^(CO'OOiOO rHrHrHrHCOrM(rH rH rH rH OOt~tN'NOOGOCO 5 rH (M fN COCOrH(M rH 00 o 1 S^^^olSS^SS 1 rHOC500-*COCOrHCOt^ rHIMrH COCOC-lIMrHrH 8 rH rH rN CO * O CO L- O. C5 O a $ (fl l rH rH CNI CO O-l CO C-KN rH (M Cq CO CM CO'^rH CO (M Oq OCOCOCOOCOCO-HCOOO5 COO-lrHr-lrH(>4COCMCOCOrH rH CO 1- -HH irS 1O C5 * CO O t~ 1 (M OO5O5CO * L~ CM CM CM CO CM CM rH r- rH Jj CM CO CM CO CO CM rH ' rH S CMCMCCCCCOt-Ot-t-X rH CO CM CM -* CM rH 2 5SS5S3giSB i 1 ""SSSaSSi&S OS OS 01 9 rH rH CO rH CM ^ CO CM rH 1 H rH rH CO OD rH T^ lrH rH 3 Oi O 1 'O l^~ C5 ^H CM ^^ CM 1 rH U> CO (M eocoo-^ro-^iocscoio i-HrHCOCOtMrHrH-^COCM OlCOt-.O5OrHOrHCO rHCOCO^Mi IrHlOCOCM CO CD * V) IQ rH t^- Cl CM O 1C rH CM CM CM rH CM rH rH CM CD t- rH O5rHCMCOrHrHlOOt^CO 1-HCMCMCOrHCOrHrHrH CN O5 rH CMrHCM4t(rHCOrH rHrH rH O CO CO CM l^ rH 1 O5 l> 1C (N C5I>rHrHCOCDCCOl>-O5 rHrHrHM O' rH H^ ^> TH~ to S!3f!^-?S3 i.oT H H rHt>-CSCDOOO-*rHOd rHCOdrHCO-!tl-*OlrHCO g O rH 1C * d CO CS C 00 CO rHCO rHCOdrHd rH $ rH 1-1 drHOOOSrHIOOSCOO rH Tt< CO d CO HH H^ rH CO i rHCO>CCOOCDOOOrHTt1 rHCO rHOIOIrHdrHrH <& r~~- I rH H^ CO 71 CO ^ -<*1 71 ~ d i 71 71 rHrHCOrHdrHrH r < 2 OS 00 d OS Ol * t~ CO OO IM iH CO Ol rH CO -CO -* 71 d i OClCCOSCOCSCOCC'CrH d CO rH rH CO (M rH rH d S S pi 2 TH HH d rH 71 71 H 71 d O i THOlrHdrHCOdrHrHrH $ i 1 3 CSCCCCt-rHCOOOCDCDOO THCOdrHC07lTt- OC' X CO O 1- drHrHCOOlCOrHrHTH S 71 fH H n i-t H S33SSS8BSS 1 CDOOOOCOdCOCSOSCOO d rH TH COd CO rH rH rH i w H n rH H 4 H MIB8S 1 8 SSS3SS ^S 71 H H A COCOCOCOdCOCOrHrHi-H CO dOOSC51O-tO >O CO CS * drHrHdOlCOdCOrHrH 1 S 5 838838383S 1 OOrHrHCOOlCOOOOSCO COddClClCOdClrHrH 3 *i C 'O t-- d O CO CO t~ 1O CO TH CO 71 Cl CO -f Ol rH CO lOlCCOOSCCOOCD'*rH-* Ol rH d rH Cl d 71 71 Ol rH CO i 2 ^^^^s- i *s*a***sxx 1 3 CO rH d 71 71 5* CO 71 71 i O CO O O * CO 00 00 Cl 00 drHdddCOd d rH l-H rH CM 2 Ss-889988^- 1 C-l rH rH d rH d 71 rH Ol rH 1 3 t- OS CO 71 Ol O CO l^- 71 O IM CO d 01 -* CO 01 71 rH CO 5 *! 7ir-"C-*OSlC-*00 COi iCOrHTHCOC-lrHO-lrH 1 Pi rH 17 l~ 1 O h- OS OS ^ O rH 71 CO 71 rH CO CO CO 71 rH ro CN COrHdOCDt~-COCOrH-f COrHCOrHrHCldrHdrH 1 . 1 rH 5 3 m rHrHrHrHrHrHrHrHrHOl S oi iH Ol CO Tf O O 1- CO CS O rH g ti b-?l^I-,3i!.3 % co_ O CN rH O>1 rH ^ ^M rH Ol Ol i f CM Ol I Ol O CO O O 'O rH O 00 TjH O CO rH -H^ CO rH Ol i-H r- < Ol O-l 1 s-sassasass 1 CD Ol CD CO -^ Ol CO -^ O 'O HH CM rHCOCOTHrHrHdd7l S 'O rH !>. d X * OS CD CS X rH d rH CO 71 rH rH rH rH 01 01 71 * rH IfJ d d 'X 1^ OS OS CC -H 71 rH CO CO rH 71 rH rH 01 d 1 Cl rH rH CO 1~ X O CS OS CD rH 71 71 Cl d rH 71 CO rH d Ol rH 71 d O d""rHCOCOrHCOdd71d 91 s'sssssssssas S S^S^SiSS CO 71 Ol THCOCOrHC-lrHddd i O >O CO "O CO d O CS 1O CD CO d rH CO COrH I-H rH d d d 1 OS CO CD CD rH 1- 17, O l~ CD CO rH rH rH CO CO rH r- Ol r- 71 Ol CO CO rHrHTHCOdrHrHrHrHIMOl CD CO d OS O CD' rf O CD CS CO * d rHrH71CO71d rHtHdd 1C rH d OS OS TH Ol ^^ OS 71 CO CO d d rHdCOCOrH OlrHdd rH d rHdCOCOrH rH Old O d rHOldCl'COrH ^rHrHrHd CT> O) rHCldCOrH rHdrHOl 1 LO 00 OC 1C I.O CS 00 CS OS OS rH THrHrHdOlrH rHrHrHd i rH rH rH d Cl rH rH 71 f-H rH 71 1 rH d TH d CO Ol TH d rH rH rH | -H 71 CO * 10 CD' r^ 00 OS O rH 71 d d d d d d Ol 71 CO CO a & 9| o 111 ^ -i - - OS rH Cl gj si Ol CO cS rH *" 01 -* O * *' - OS * c o o M m X is r- IO 1C CM o 1 O s CO IO X O5 -* CO * 1C rH 1C o I !* 10" 1 iH H tH 1- 03 rH OS S 00 rH CM t-; ID * 10 rH t- X CO 10 rH rH 10 rH 05 US 10 O rH Q] 10 05 rH os 55 05 55 CM t~ 06 rH CD * IQ co oo rH CO rH I- CO CM rH Tf rH OS *, CM ' "C CD t- CD CO CC ~- 05 $ | os rH CM A Oj 05 05 CO O O rH 01 m rH CO CM X 8 K 8 ^1- t~ co cc r t- co 00 P CO g CM * -O CO (M 0-1 10 10 CO rH X 10 i^ 1C CO T r s 'O 00 10 10 CO c- as O3 (N CO OS rH SI SI CM 05 oo 10 -* (M rH O CD r- co O CD rH OS 90 CO 'O QC 1O 1O 1O CC X R rH CM rH M CM * 00 00 CO rH -* o 10 rH * CO CM 05 CO I OS rH R 5 CD 03 rH rH >o co rH rH 1O rH 1^ X rH rH o c^ 8 CO CM os rH Ov "0 CD 00 CD oc C rH oo * CO t~ rH CC X rH [-; % s= aS ^ 00 05' -* 10 10 t- 05 ^ CM rS rH cS * -< 0? o o CC t> CO IO rH X OS 1C CD 2 o 10 * l~ O5 -* CO 1O t- 05 CO CO OS rH CM H CO CO CO 00 rH rH rH X 05 X *1 o 1C A o 1 ^ t~ oo * CO * t- QO * * m OS rH 91 "1 (N OC 01 CO 10 X t~ 1^ co OS (M X rH os O H R s { CO l~ CO (N TH t^ x' CO CM ?5 CM" OS rH iH CM H rH oo * O5 00 05 (M * O Tjl X * 1- 2 rH s CM X rH CD 05 iH CO l~ X 10 OS x co "* 1C rH CO 2 f> 1C 51 1^ t- -* CO CO CD 00 T 1 8 CM X rH CM 3 O so cR CO O .X 00 CO t-^ 1O X 10 *' t~; CO OS CO IO X 10 rH (M CM CO CD rH ? H ?! 'C (M 53 CD t- rH rH - a IO rH s s CM S3 rH .H CD ^ ^1 t~ X O X rH Tf( * CO CO o CM 4 3? rH CO t~ 1- 1O 1O s s a c 1-5 February.. . J3 I ^ &> ^ 1 rb ? ^ -i-> i/J 1 3 September. October . . . . November . December. . Annual Sum Means . . . . (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. I r1CNCO-*IOCOt-COCS r1r1TJ*t COi IrlOOS CN CM i co CM O t j; X t^; CS CM i-; 1C OS ' ' 00 x' 00 OS X x' CM CM >7-l CM (71 CM CM CCCSrHlOIOlOOOCOO tOt^COr^-^i-HOCD-^CO CM C t~ O 00 CC OS CM rl O OS CT rl * CM X (M CM CO X' CC O CM CD t-; 1C CS CO CS 0-1 ri 1C cs ' ' oo od x' cs x x CN 171 CM CM CM CM CM CM O l.~ O CS X X CM rH IO CM CM CM CN C?i CN CM "oos co oo CrlooTicT-* r. fe 71 ~,\ O s CO -t CN 50 OS CM CO CM t~ CD CC -CO O X I g ' ' H-. oo X 05 x co cc oo (M 17-1 oc o C-1 (M m CM COCOOSiOOSOCO OO OO CO CS OO CO CM CM CT CM (M CM OSi-H7>iIX'5Oi lOQO t- "O t~ O (71 O OSCOOl lO OSIOI OrtC X X CS CO X CM CM CM CM CM 5 Olt^t-CM X ' ; X rH CO CO coos CM CM t^ CO OSlOl - tO CN OS IO t CO rH t-* X' Cw O 1 (71 CM Ol CN CN CM Ol CM i jq CM >7 00 t- -H i /7 3 CO rl (71 CO * i~ 5T 1 - CO C: R COCM tOt-OSOt-COrliarlt- OS (M COCOCNnOO-^lO- C7 CS (O CO X ^ OS CO C CO CO OS O 'O -f O CO CO COrlOl-lOO^ 0000 OS CM CM CN OS 1- 1- COCOO OS O CO * O CO IO 1 - CO i~ 1-1 -^1 -^ 'TO X 7j (71 CM C: 00 CO COr- lO CM OS T* CM * X CC O CO * 1C CO CO Cl CM O O CO * X' C IO co i-; 10 1- cc -* ri- o cc i~ C5 CM OS~CS CO -* CD r-i O^t * I- CO CO CS n I-H CO 'C -* t^ O *sf OS ' OOOO CS M CM CM CM CO C-l n f rH CM CO CD i o, 7i y. z - -. : r- :- - ~ . * IO CO rl CC r- ^ -* OS CM CO OOOCCS CN CN CN l- t~ CO CO O CN O CO "C C-. IO CM CNOi tCOCSOSOr1Tt * CM CO 1^ [^ * "O rl l~ t~ O 1 COCCOCOCOCCiOOCN CO O CS -* 1^ 00 C CO CN IO CN CO 1- l~ CO ^ '88 CMCOCD OS K CM O CM CO l~ l~ CO l.7> n t^ l~ O XOOCOlO-f IO tO O CS OS t- g CO CO oo OS (N OOOOCQ CN CN CN o -^ 10 --^ o o -^ x x- 1^- oo ! t^lOTf-^^HiCriOr-l-^n IO CM rl 1~ 1- CO Id CN OO I~ OS CM CM _co_ CO 8 t-C t~ rl 'CO CO CS' Tf CM ^ CO iO CN n l^ l~ CM 10 CM 00 t- C oo oo oo CNCMCN OOO T* CO CO CN t^ (7-1 CO' O 1- l~ CO I CN _co_ CC OS CM CO 1- o> OOCOOS^CNCNrlTflCQO t^l^O-^HrHIOCCt^rlTtf CN O t^ t- CO IO CN 00 t- 1~ 888 CO l^ CDC X CO * IO CO |-~ CT.' -* CM IO OCOl^COlO O CO S CN O t-t- CO O rH CN - rH t- O O 'C t- tO O - CO CO O O 1 7 "*f CO 71 O 7 1 7-1 rH rH CM <* "*< >Cf>cc rH -^ IO rH IO 1C O7 rH -^ X CM ** CS CC CN CS -3< 1^ i.O t~ GO O t rH O I.O 1 - rH C T-HCOiOrHlOiOCOrHTf 77 -r 71 CO --. '-. ~ -c 71 5 w r-i t- o rH co t--o5 ie rHCOOrHtO.lOCOT ICOCO S CC 1 CM | O) CO Ol Ol O - J 71 Ol -Hi IO IO rH CO S CM Tf IO CO Ol CO CO 8 ' I - CO O rH O GO CM CO t^ CO rH CO 'O CM W3 "7 5 71 CO X CC CO 1^- CO O O rH 'CO X rH i ' rH CO IO CM "^t* CD *H^ Ol CO !> CDO5t->OrH-t!CMCOOC3 Tt< CN CC 'C CM 1- 'O U5 O 1C t~ CM 35 O CC' CM CO rH CO 5 CN Til I7"f CN CO t^ 8 l C5 CM O5 CK CO l^ O X 'O "O O CM ^J< CM CO 'O -HI CM CM CO oo-H 5 CM 1~ C-. CC (71 ^ O CN 71 OS ' rHCMt^COt^'O^Ol^ CM ^ CO CM IO -f CO CN KO a i rH CM CO * 1C --O l^. 00 OS O CM i 1C s? 745 i s i OB rH 0-i CO -* 17 -~ 1- X O s X "^ CO i ~ X :C I "" i ~ 'f -fi CS O tD -f tD I ~ 1 - X 1~ X i 17 -f -t; CO X cs ' x o; x x 71 7171 7171 VT - OS tO Ct ~f ~t* 1 - CO 77 I - 71 l~ rH O O * * t~ CO CS ' X ' ' ' CO CO Ol CM Ol CM Ol t-- CO 1- l^ O rH 00 "O rH CO C'I Ot 'fi CO CO CO O 1- l 71 71 71 t?) -N ocococo^ococor-r; CM 1.7 O '~ 71 t^ ^ rH 71 00 O l" r- O S * 00 1> 7-1 Oi 71 L 7-1 TO CO CO C ?,?i - 7 1 y 71 -ti 'tj o ti 'tj o co rH-^'7'l o x -f r7 x r-. to '7 7i x t- rH X * TO 1~ C-.' C rH CO CC CO 1 - rH rH CO -*( -n.O 1(5 *O '7 O ' - CO CC' CO l^- - -t O rH *O CO rH * CO T^ rH 71 CO i-7 CO r-^ /7 Oi 00 Cl' 7-1 Ol <71 GO Ol cs oc co r- o *7 01 ci O T-H CO '-7 -* O' rfH Ji ^ CO r-t 7-1 TO O CO rH 71 T7 -JT 1 - - '7 - '~ ~ XT COCOCOCOQOO-H^CO-^CO Ci -^ CO T-H 7-1 CO' CO 71 'O' O O CO 1- I- CO X- CO CO 'CO I.O CS IO * rH to CO X C I - OS -* X; rH CO CO tD CO CO LO- OS X Ct cc Ol Ol Ol CM O l~ CO CO IO' l'~ 00 -^ 1 IO X) T-H CO CO CO CO CO' I 'co os '< I Ol Ol . O5 i.t> O5 rH .CO 'CO CO CO 70 1C5 O5 oo CM 1 os co o as 71 -r 10 oo OJ O C7; '7 71 71 1 co co -r :r ?, ? i 7IC'71-r7 >7 X X ~ 7-1 C CT. CO O X 7-1 ?-, l> b- (N O CO 1~- X O-. s I 1 co co 1 oi oi Z CO 01 (M Ss 1 oi CO en CM -. tS ~ O 71 ^ C O-. -t to 1O -* -H CO -T tO 17 17 C?. Ol 7-1 7-1 ?i rH CO CO CO 17 '"i / OS CO X X CS O-l Ol 0-1 71 Ol S'7 ~f to ? i~. i^. i^. -t- rHCOCOCOCO' CC I-- C as CM 7J x x x r: CM Ol 71 71 CrHC X CC 1 ~ X C". ~t '7 ' rHCO 71 l--t X X X X CT. 71 71 71 71 CD 00 tO ^ O5 t- 71 i x i^- 1 - -r o c r-t CO '71 CO X 1 - rt * CM Ol C; -/. 17 i-cocnt^cocooco rH CO T-H CO' OS CO l~ C5 X X X X 71 71 71 CM Q CM 1C O-l t-H CO rH X t~ l~ CO CO rH CO CO -H CO O CO 1- O~. 717^ CC CO T-HCOrHCOrHCOC rH Ol CO 71 71CO O t 00 C5 t^ X ~. O X rHCOrHtOrHCOOC CM 7"l 71 Ol 'O O X l^- iO O CO 71 -t O X ~ 71 C7 Ol O rH O -* 1- t~ Ol Ol -* CM t- CO Ol CO Oi ?7 X 01 -^r7~'- CS Ol O- O l~ C 01 co 01 1 ^ 01 to P CO 1 1 --i 7-. Ol CO CO OS 3 oi I-- CO OS rH rH rH Ol CO CO Ol O -t CO CD rH 01 co 01 1 f 71 to o: rH CC O O ~ O CO CO -t -f CO OS X CO CO 1- CM CO Ol tO -P Ol CO CO TP cs i.o c: co -tn 10 I- CM CO CO tO CO -* rH I.O Ol CO CM CO i.O Ol tO X cs x x /.' i- |~ [~ x to * X -H l~ tO CO rH O O CO CO -H Ol CM_ CO IO CM IO CO OS ' OOCOCO Ol Ol Ol Ol 1O OS O to CO to X rH CO CO OS Ol tO l~ rHOI 71 >7 17 71 17 - CO CO **< C7 o "1" "~ "/ Ol * O 17 O 17 1- OI 71 '- 17 77 17 X CO O Ol CO < 17 to -t 1- X Ol 71 17 17 CO 17 X Ol 7~1 7~l 7"l O' ~. to '7 -- i^ o; os o i^ cc Ol Ol -H- 1C -* i.O CO CC X X Ol Ol Ol 'J 17 17 I - OS 71 C 77 tO O '7 CO 17 I- O CS 71 CO -f tO -t i7 OS x' os ' ' co cc co 71 71 CM Ol CM /. X X 17 tO CM O 71 CO Ol tO OS CSOlCO-fCO 1017 X 00 cs 01 CM CMCMCMCMCNCNC>5cM 1 1 M ft Ol CO 7! "? CN Monthly Sums. Means. I cs rH 00 CN IO CM CO rH rH OS T-H CC' ce I i OS T-H oo CO as oo-rh CM V} as co 06 co rHCMrHCMCMCCCO-HCOX rH t~ OS rH rH O 7-1 CM O C-l OS CO X OS CM CM CM CM rH 1- 00 rH rH O (Si CM CD 8888 ' SjCMCM^CM X CM "3 O t CD 1^- rH CO 'aS ^* C-l rH C T-H t~ 00 rH rH O CM CM O ( asoox as C-l CM C-l C-l rH t~ X rH T-H O CM CM O C-l CM CM CM CM T6^O^CM~CO i6 lO t^ CO rH O rH t- X O T-H O rH C-l O 1 C-l as xx as C-l CM CM CM tOOC OSas. rH CD 1- O rH O rH CM O CM SC COCDt^'XCO-COr-tCO t L-- O rH O rH CM O CM Ol CM CM CM lOCMl^rHaSt^CO-HHCOrH t^COCDX-^OOWCOCOCO O l^ L^ O rH O T-H C-l O CM as coco as CM Or-COrHlOCOCOrH a CC as C-l s (M 1^- Ci CM CM S5 rH as CM as CM c lt>CirHCOO*OCOCOrH COo o CO O CO CO X 07 OS T-H -*K CM 0000 C5 CM CM CM CMrHt--CDCOCMCO"O- CM . CM CM CM US S CM rH t^ 'O CO CM CO "O * CO as 'x x as CM CM (7-1 CM T-HrHrHrHrHrHrHrHrH 02 (82) -H c-i co ^ o CD L^ x os o rH M CM CM CM CM 71 71 CM (M CO CO . rH IO rH L CM C CO CD - CO C 25 OD QO go os (M CM CM CM rH ^ co c.7 co co as co t PcDXCOrHr- -' x' x x as (71 CM 71 Ol i .- CO CO CO rH O CO CO 1- CO >O CO CO ScDXC 1- CO >O CO CO -^l-COCOCM CM c5 C O O ~f 'C- O O ^ CO 71 O ^ -1 CO 1C l~ C: a: rH OC O 1O t-. 3 ?- CM t-H CM -* 1~ CD ?7 71 CO CC X as CM CM CM CM 05 , |i 5 CD -* as as Ttf C l~ CO t IT! rH CM * CD CO CO 00 CO 00 OS CM CM CM CM i- 7i o rH -t co co c-i -^ t: 71 O CO O C: O O l- rH - t- CD I-; rH C-l CM I" - x co x' as C-l C-l CM CM p QQ ic o oo oo o i c- GO c-i C-l Cl CM CM (M 1- O O rH 1O O t O D- rH CM rH O CO t-" TO CO t- LO t~ rH C-l GO x oo as CM CM (71 C-l rHaiCOrHOXOf go go go cs -1 COOt-COCOCM X US rH 71 -H^ l^ C: X O C CS CM US CO CO CS CO CO (M O' ^ CO l~~ ^ oot CD us r iO ia X X iffi CS TH CM CS CO CM l-O X L^ TH 1O 5D X L (NOOVSOAO CC: CM ^ CS O CM rHlM CO CO ioio 8 (NOrHCCCOO CSOCMI^CSCOIO-^CSO 'O CC CC Tti 'X Q05obo t*- CC l-^ rH ooccusocousococc CM O XI t- ^ t^ 5C CO l~ X X i-O 1O O CO X t- O rH ci c>i (M cs t O O CS O * CD 1O CO x x o o co x co t~ I^ CO CS * CO Ttl US CO- t-^ OO g . . . ... OOdOCCOrtirHOt-CO COCCCST-HrHOSl-OCOCDCC t-OOOWSCOCOCCt- 'C O xcr~xc: rHTji^ic^ CD X US * 1-7 X CC l^ 17 8 CDCCCCTHUS T^lCOiO CCt-USUS CC ^^ *^ OO QC t~~ *O ^O i i X O ffC X> J -7 O 1 O CM X 't X ~ O ^ X O O CC CC CC Tfr i.7 OC GC i-*- ^ i" -CO ^^OOCOCOCOCMOOI^CM COCOOrHCOrHCMrHCMCO , -*1.7QCCO-*CM- o o i-C 1 CO CO CC Cl rH OO *O C> H CO O-1 ^^ CO (?! CO rH 1 CO os CM CO X 17 I~^ CS CSCMt^OCM ^ O 1-7 O t^ 1-7 OS US 1C O OCMX'Oi-nOCOOcMt^ USCOCMOCOCOCMCMCMCM t-C3OCCUSOCOrHOX T frHrHOOCMCOrHrHX USCOCOOCOCOCMCMCMCM 8 OS-^lCOOCOrHCOCOCMCM CMCOCM-hCST^CO-fCOrH o o C us co co o CM A 5 e CM-CO CC 71 te CS CM 1 CM CS CM CM CS CM 1 71 -. 71 -x I | 71 a; &T (M . 71 US n cs 71 ~S 00 1 7^ s CK gi a 882-9 n co CM gg ? CM oo QC 3 5 CO 05 QC co oo 00' S 3 M 00 CC cs CO 5? ^ CO r s 00 US US rj CM CM CD -^ CM J 1 i |i 1 |5 I COCM7OIOCOC^1OCD COCM-HCMCMOSCMCO X CO (M (M ioOrHOiocooic.r~-'O CO O CD CM C-1 1C O X CM & CMCOCOCMrHGMCOCSCMCO CM CM CMCMCOCMrHGMCOGSC CM Si GMCDiOCDCOrHOCMXOO ^i^iocococorHCOcocD CMCMCOCMrHCMCOCSrHCO cot~ocDcMGM-*ococo ^ICIOCOCOGMCOCOCD^ CMCMCOCMrHCMCMCOrHCO ^ -*c (Mc cocMrHCMCMCOrHCO CM CM CDlOOCMiOOiOrHOt 1 CO^-^GMXOr-COO^* GMCMCOCMOCMCMOSrHCO ST^jJiiOOCOiOOOX'O GNCMCOGNOrHCMOOCO O5 ' CO O CM (M (M CO-*Tt ci CC M CA CM CO CM r~ oo 8 (M CM G < lrH|>.C/;' JO C-1 ff-I CO ff'l rH "^ *O " ooceoococ^iooo CO O= *O t^* CC Ci !^ ~ X *O COCOGMCOCMO'^'O^rH O O O O CM 1C CM O rH O lOCMSCCOXOCOCMCMrH COCOCMCOCMrH-^ol-OCSI OOOOOOO-^CMrH COCOC COCOCMCOCOrH-^COlOGM O5 CM COCOCMCOCOrHTtlCOIOCM CM COCOCMCOCCO-*OIOCO COCOCMCOCOOTjHCDl CM ^^ l^~ C* CD C^ C^ Tt^ CO *O COCMCMCOOCOCOiOCO t-COCOCNrHOSGMOt-OO *C CO X Oi O Ci CO CM 1C *O CO CO CM CM CO O CO CO iO CO XCCO CNCOrH COCO*CCO lOC^rHiClOCDOCOOCO CMCOXCOT)O O O t~ "O CM 00 10 CO cooqr-C5O-*ocor~o COCOCMCMCOrHCOlO'O-* (34) CM "i CO CM X fe CO CS t>l CO oa CM O5 i I CO 01 CM CO CO CM CO O5 CM 3S CO 1 CO O5 CM t- CD IO 1 10 CD 1 CO CO CM CM O !> 1 !>; 1 oo CO CO CM IO s CM oo CO 1 CO I CO rHCMCO^t>OOr-X>COrH CM CM CM CM CM CM CM CM CM CO CO X O ^f JC CD t~ CC -t 1 o 10 -* t^ rH co rt '-T CM ci x o co co CM r-J rH CS X O * rH CM rn CO CO ' ' CO X OS X OS CM CM CM CM CM CM -7 C5 X X IS OOC:C;OrHOCM O5 CM X OC OO O5 CM CM CM CM oo x" x' oi CM CM CM CM X O CMt^CO rHOO C * -^ CM Ct- IO CM O COXl^XXOOCO Ot^CtCiOCMOGM r Tt< t^ CO rH O O OGMOI~COXr-i C: 1C O X rH O -^ t~ Ci O O CM rH CM IO O t~ 1C : 1 C CM X CO C t^ClOOCMr CM CM CM rH t~ X CT C; CM CO X 'O CO -^ GMrHOOl^CiOOCMrHCM GMO-^rHrHCOt^OOOt O rHOSCJI^CMrHCOait^T^lO CMrHOOXCOOOGMrHGM X CM CM^rHOXOJ -HHOXCD OOCMrH COCO C5 CM CM CM IO CO CM CO CO CM 1.O CO rHOOCC-*OOt~ CMCMrHOOOCOOCC CM CM CM CO CM CMCMrHOX t^t^rH CMrHCM O (M O CO C: O O -^ to l> O CNCMrHOCOOiOOCMi-lrH O5CMCOCO-*CMX001O1OO5 COCOOOC:Cr) IO Ci rHCMO t^t-l CMG5CO t~^ CM X rH IO "^ iOCOOGMrHrH co x on x os CM CM CM CM CM rHCMOrHOlXOOCMrHrH CM CM CM CM CM XrHCMXXrHCOCOCCOCO t-t-CVOIO1^0MTj(O3t^CO rHCMOrHCSXOOOrHrHrH CM CM CM CM CM t-* t^ CO rH CD 'CD CM ^^ OS 00 CO rH CM rH rH CS 00 O CO rH rH rH OS ' ' CO CO CTS OO OS CM O) CM C-1 CM CM o x o ^t o - -TO * - 8 rH^-rHC ' t -f c; GO LO c: t^ *tf ** 'cNcNcOCO'^'NCOrHO O X' O ^ 1>- Tf I - * " ? 1 77 1 - CN C2 ^ X t^- CO O CO I a CSIOt^CS'TMlOTH-'ttrrH O CN co l^ t^ rn r~ r-i c: t-- -*COrHCOCO-*COCO ' CS 8 CM X O TO ! O f>l C5 CO T-H CO C CD 5O i 1 'M *C CO J-1 rH ^ CO ^ ^ CO CO * ^ O CC X CO CO CO 3 O L^ CN 'Ji iO 'od OS O CN CN LO TJ< X O X 00 X X 'O c: -* x x ^ r-H 01 x co r-i-*COCOCOr-" COOCOO s -* co r-i >c t~ cq ws co lTtiTj(Tj * I-. O CC t- CC' CS O t^ G5 CO L- -^ ? CC t CC -^ CC' -* t- t- 'C 'O CO I- CO t- X -*ti CO *O r- i O X CM O CO QDOtt-Pi-HCP^'t" < ' CNXClCCOCNCDCDCQOi OiCCOCOt-COrHtQ^lt-- T* CO CO **- ^ CM r- < CO CO i I COCOTT'-^COOCOCOrH S CC "^ "^ "^ r- (CCO 1 'S ' < t CN CC O O O CO co co co o r- 1 1- x t t- -CMCOrH 8 in r- CM * to CM LC cc i~ cc - 8 COTpCOOCOCDOffO o t o o i-t cc CM o CC -^ O ^ r- 1 COOCOCOCO'HXOrH'^4 lOC-^COOCNCOXCNCO ' CM "* CN C O r- ( O CO CO CO O r- 1 rfi CO CO COt-COOt- CN 8 rHt-CNOMt-COOiXXOO - XOitCOCOtCi*Or- < r- I ' s^" 3 X g So i co i ;S t^- ^ti CO O OO CO t-- O 1 CO CO Ol I rH O i t 8 s 3 CC 1 I-H 01 co co 01 01 c 8 ' OODt^OJOOOOi it i 1 t^OJOO 1-1 >o -* co O O -^ -^ CM Ol 8 8 8 i (-T i < L-- o x Ci ^r ^ x t co r-i CM -^ CO CM rH O r-< i-H CM ^ O X GO t CO CM CO CO CM i-H O iOrHCNi-HO O O t CO X X CO X 1 C 1 ) O rH ;c T ' '" O O i < T-H ^ CN >O Ct Cl C5 Cl CO t"- X CN X 1 i-H (M CO CO CM rH O t I r-< T-l 'M c: to cc i CD cc o '-: :c : i :t CM IM CC CC O ~ I.I O l~ O X rH G>1 CO CO CO r- O 1-H r- * co t~ c: 8 CO CO tC O <-; S 8 ' r; O CC 1-1 U> CO ~ X rH r- CO -* CO 'N O ri r-l CM , 5^ 1 PI I fl OOSrHCOCOCOCMiOCDCO 8S8 ' -fl I - O -t rH 71 1- O r-tOO^TOTOrHCO r-r rH O^ rH CO CO CO CO O O CO CM O'^.HOrHOOcNh- IO OS 1(5 l~ O 74 rHCOOSCOl(5CD (74 -^1 IO r~ CO CC CO IO O 74 COOC-lrHr 'COOSCOIOCO rH C-4 CO Tfl 10 CO t- 00 OS 1-HrHrHrHrHrHrHrHrHCM (37) CO i 1 1 g OS i s 0-4 8 8 CO OS 71 (74 8 CO OS CM 5 Si 74 OS 71 CO CM t- CM CM CO O4~ OS 0-1 i-l 71 CO * O CO l~ 00 OS O r-( 174 71 71 I?) (71 71 71 7-1 "71 CO CO t"- CO CS i I Ttn Ol CD 'CD X iO CO I-H O-l CD 1C 1C CC -H O X CO O IO CM O-l CO CO 71 CM (71 Ol rH i-H 8 ' 7-1 CO K CC 1C 71 -f O CO 10 ~~ IO 71 (74 CO CO O-l 71 0-1 O4 rH rH OS (74 CO i-H CO -* 1C OS X CO "O 1-1 HHiOCDCOiT'rHCOO'jCOCOO 1.7 (74 71 CO CO 7-1 71 rH 71 I-H rH CD CD r. r 71 ic --. -/_ cc -n -* CO -^ CO Tf rH CO X' 'C CC l- 1.7 (71 (74 CO CO 74 CM i-H 71 rH O 1O (M 71 CO CO 71 71 r-c (74 rH 8 OCOcMiO-^HcM^GCOOO-l lOOO-trHlOrH-rJlcOlOI-CO 1C 74 171 CO CO (71 71 i-l (M rH O 71 71 c: -*" rH - LO CO CM CO CO (71 0- C CD 1~ Ol CO O -*" rH - 71 -* CC -f CO -t> 0-1 rH 71 rH O 00' CO "* rH CO CD CO' i-H 115 CO 71 '.7 CO (71 CO CO 71 (71 O-4 (71 O4 O r cc i - -. -f 7 1 -* 7 1 rH 17 ^ 71 CO l~ 1' (74 1.7 5 CO O CO 5 CO CO Ol ^l CM W i-H rH CM CO ^ 1C O t-- CO Ci O 1 i i O1CMCMCMCNCMCMCMCMCOCO s 3 CO X 01 CO o fe O4 CO (N S3 CM CO CO (N (M CO CO to (74 oo CO co o co; ' C7 g 0-4 ol (74 i I * i. r 8 *C rH 8 04 00 CD (M 1 o OS - S t^ CO OS CD (74 OS OS 00 O IO CO g CM CO t^ 00 00 (M 8 li a a 3 S PH H W a H H P4 H GD I COOOCCIMOCOCOCC'CO COCOCSC-lCtClOCCrHCO - COt l^t~ COO1 CNIOCMCOCOOCO t t- C (NC6OOO!O co t- coot-mo C^COrHOiOOOO CM t- t- l> t-; CO CD 1O nj ( os (NOOrHOCCOCOOOCOCOrH *O(MiCOt-^J>-OCO t--t t COCClO-rKIM COOCqcOOCOlCCOCD t-caoocoiMOTdcooco rHOOrHtrHI 1 t-COCDlO^CO Ot COOOCDOt OiC 1 ^ CSlOCMOOrHGOCnOCOrH rHCOt 1 I COCOCOT^CO OQ T t (M CO -^ 'O CD 1 GDiOb-CMiOT t CO CM i 1 rH ' ttCOQOlOOGOOOOCO CMOCOCOSOT^COOC-ICO GC I C COCD< CM CO CM 1~ rH!OT)HlOt-CO-*C- -^ 1 - CM CM * rH -O rH COiCCO^tlcDCMGMGMCMCM aslCrHCDCOCMlCrHlCJ '^ 1 CO (M rH CM rH C -^ tO CO ** CO CM CM CM CM CM ) o co C CO O "^ *C O CO C 1 ! CO CN C 1O O O t-- O' CO CO SO O CD (MC5t~lOOOCOrHOG>O 8 i ICOi ICO ^ 00 to 00 1 1C 1 1 1 1 1 CO CM O CD (M & CO OS (M 00 o (M T-H o co CO CM 1 CO CO oo Tl 1 CO 3 CO CO %- I 1C CM_ CO CO CO o 3 1 OS 5 CO co 00 o * CO CO ^. a CM CO CO -* CM ^H I! CM CO *f CM CO CO CD rH CM $ 1C CO 1C CO CM OD ao * t OS 1C CC OS ss o * * CO CC 30 r-f O CO O Tfl iO -fi r-eG '-7 O O T*< O O & O *f 'O (M O CO CO O rfi KT> to Tp O rH 1C CO CO Tfl Cf. 5 ' OCOCDCMCO-*rHC: OOOS 1C I CM 'TO ~. X t- O CM CM rH 1C CD CO -^ CO tO 1C * 1C .OCDt-CNOOCMOSCOt- CN CO C-l CN CC CC :D O rH - rH 1C CO CO- -^ CO 'O 'O -* 1 SOOOS-rfCOCOCMC rH CO rH OO 00 CD C rH 1C CD CO Tt< CO '7- 1 . 1O CO CO ^ CO S3 CO CC rH (M CO CO 1^- - CO O I- ^ X' X C r O O O CO ~tl CO '-7 jco CO rH O5 -* rH O5 'O 5O 00 1- O O ^ l^ -^ -* ^ 'O 1O -^ O * OS 'Oj'f OS CD O Q Op (- - 9 OS CO rH O O CO 1 Cl ** rH * rf< CM rH OO IO CM < CO O O CD CO 00 CO CO O O rH 1C CM 00 rH t- CM t C' CC CC CM C: O CD 1C CO T^CM-rtlCOOTjHCOCOCCCO 00 OC C1 X t~ O CD O O I CO CO -* -) Cl rH O; : CO C5 rH 1C O1 -)< -* O * CD CD OC' 1^ ' i O 00 00 CM rH rH -^ O rH CM O 1C -pCtrfcC-fOrHCMOl O CO 4 * O rti L- CD OS I 1C CO -^ 1C < CM iC 1C r}H O CM CO O rH CM OO-i-OCM CDCiOOO > * CM O 1^ 1C CM CO CM ' 1^ CM CO ~tf CD CD OS OO 5 CO 1C O ?O t^- *C 00 l~ Cs OO O CM CD l~ 1^ t~ O r~ CD 1C 'C r^ O O O CO r- 00 iccocoicocoi^-icoot^. rHCOI^COrH i-HO lCO CS CN O CO t^ GO O O rH CN CM CM CM O) T^ O CO *O CO CO Ci C 1 ! (M CO t- 'O l^ CO CM 4 ICCOCOlO-^OOCMrHrHrH OOCCr-iCO'MCDOCDO>OTj< CNCOrHCM COCOiOOO^COiOOOOt- l^ t~ O W Cl i~ -M O C: CD CO CO CM 1O t~ "O l^ * CM CO rH CM C CX) CD TO Ol IO -* O O rH CO CO CM 1O l~ 10 I -^ CM CO rHCD t^CDCMrHt^lCOOCNOO -* t- 'C t- S CM CM CO rH Cl?O CMCO t-HOOCO'*IOOCt~lOCMOOrH t^ -^ -* CD t~ l~ ^ t^ t^ CM 00 CM-*-* I ICCOCDCMCNCOrH r- rHCOt-COrHfN COCOi CO -rji O CC t-- CO Ci O CO Ol CO X CO C Ol Cl CO O OCOCOCjrHXCl-^1017 8 coor cct-coioc CO-OCCT . J OO 1- Ol CD COCi Ol Ol CO Ci Ol Ol Ot^*OCiOOIi-i rH Ol O tC CC CO Ci ' ''' OC Ci Ol Ol CO t"- rH CO O CO >O Cv 'O rH ' Ot-CDCOG OICOr-HTpC Ol CO ^ ^H i COOCCC CiOli i *^* CC ^H C Ol CO Ol I GM CO ^< rH ' 00 C 01 O Ol ^1 IrHT^COOlOIOf OlrHCOrHClrHOlOCOIp 'cooi Ci Ol Ol Ol 00 CO Cl CM CM Ol i. o 71 g Ol Ti 1 to rH oq oi _s_ o CO S oq oi 8 to rH T 1 CO CD Cl Cl 71 ~ CO GO si 01 71 .8. X 1 1 01 co -* >o co t~ cc. ci C J7 71 --0 7T CO 7. r. V. :~ CO O 71 I~ 1 - Cl CO 71 * O ^CML--rH'^COCOC:rHrH ci ' co oi ' ' 06 ci Ol Ol Ol Ol Ol o co 10 o cc en o is co C 71 cc rH i~ co CM CM Ol Ol CM >T r ~ 71 1- c cc r - XOCOCDOlXrHlO COClrH Cl X Ol CM CM (N CO O1 CO rHt i C1-^ CDrH-HM^CO ci x ci Ol CM Ol X-*t i-H CM rH X CO ".7 T(< I f. CO Td Cl GO rl IO CD O-l Ol rH cc CC CO . 1 O t- OO O t- CO CO O CO -f O t r-* " O GM Ci i-H IO Ol Ol 17 1- X X Ol IO CO 01 01 oi (40) e 71 71 Ol oi 9 1 Ol I I CO Ol o CM IT CO CO S-! 71 CO ol oi IS CO -> 71 CO -t< '7 CO l~ X O C' CM CM CM 71 71 CM 71 CM CM CO X oi IT l'-- 71 co 71 c: i^ CO IO 1~ Ol 1- 17 17 CO rH ' ci ' x' oi -J. ~. ' ' < OI Ol Ol Ol Ol CO O 1^ IO Ol CO Ol 1C 1 - 1 - l~ CO X -J* 71 17 Ol Cl 1^ O C7 17 l~ Ol 1^ 17 17 CO T-H O co Ol X 1- CO 17 -t 71 X C 1- IT CC Ol rH T 1 O' rt< Ol O to CO 17 X 71 1 - to iO ^ rH Cl X Ol Cl CC 01 CC Ol Ol Ol Ol Ol Ol 17 O X O Cl Ol Ol CC Ol * IO IO Ol O Ol O 1^ O IO X rH X 17 IO ^ rH O Ol GO Cl X Cl 71 Ol Ol Ol Ol IO Ol IO t^ CO < 01 Ol 1^- Ol C X C 01 01 53 rHt^OCMOlCOOlCOCO ClrHClOlCOIOOlClt-C Ol CM 01 cc i~ co Cj . . CD o co x rH co co x -t- e . rH rf ""CH CO CO O IO ^ CO rH CM Ol Ol Ol O l~ X Cl rH X t- O O 'O to O -* 00 O -* CD Gl IO X' CM CM 01 71 71 Ol O 71 X CO X CO -f rH ^ o i^ . ci ~f. co o i^ 01 rH -t -t CO_ OI X IO IO CO rH 01 01 oi 01 oi ^1 CM l~ Cl X IO t- rH KS CM 01 ci ci O CO t- GC' O5 O i Monthly Sums. 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CO CO ro 0) m en " 05 CM m CO CO CN t^ t- IO IO CM CM T-H 10 rH -* CO rH CM 1 ^ CN i ^ ^ CM CN : CD i i ^ rH (N t*- Wt CD CN CN rH CM CM CN cl CM CM CM 1 CN CO i IO rH OO IO CO CM CM T-H H co i CM CM rH 00 1 ^ o i T 1 o rH CO CO CM j . a 1 E? c? ; s a z ^3 1 P? a *M =? S 5 >-> "3 oc ,*= CD V- t~ QJ t/3 October . Novembt Decembe Annual Sun 1 i (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. (45) LJ o o x: o u. a: LJ m oc ui o. CO o LU UJ o: => (0 CO UJ E s ft, _' 01 * CD E o C_ re CD '5 c 03 0_ oo c= O o oo 09 CO CO i_ <0 o_ 5 CO to f o u sc -I i u o 5 55 ^ 9 c it < (Q m !< ui tc. UJ OL to o Ul Ul DC. U) Ul tc a. N - X 0= CO V) f o u ^M i u e Z go I s " d i UJ ffi o a vp <=> *i *