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 VARIOUS TYPES OF EDISON STANDARD DYNAMOS— PLATE I. 
 
VARIOUS TYPES OF EDISON STANDARD DYNAMOS PLATE II. 
 

 The Edison Co. for Isolated Lighting, 
 
 65 FIFTH AVENUE, 
 
 NEW YORK CITY. 
 
THE EDISON INCANDESCENT ELECTRIC LIGHT. 
 
 
 The Edison Ligbl is the most perfect medium of artificial illumination in use. Its adaptability is universal, and 
 wherever artificial light LB required, it can be advantageously used. It is in successful operation for street lighting, and 
 effects a better and cheaper illumination than gas or the arc lamp. Plants varying in size from twenty-five lamps to 
 fifteen thousand lamps are in daily use, and in every case these installations are constructed electrically and mechanicallj 
 in accordance with the methods which the long experience of our Company has shown to be the most suited to product 
 the best results. All machinery and appliances are manufactured by the various Edison shops in the best manner possible, 
 every article being standardized to the most perfect model. Every defect incident to the establishment of an entirely new 
 industry, whether in principle of structure or method of manufacture, has been carefully eliminated, and the entire equip- 
 ment of all Edison plants now represents the highest degree of perfection possible to obtain. 
 
 The Edison shops are under the management of the most skilled and practical electricians and electrical engineers, 
 who have been associated with Mr. Edison from the time of his early experiments, and who are familiar with every branch 
 of the business, having aided in the first incandescent electric light plant ever operated, namely, the Menlo Park exhibit. 
 The enormous product of Edison light equipment which has been turned out, and is now in operation in every quarter of 
 the globe, has resulted in the acquirement of a most thorough knowledge of the best processes of manufacturing, and 
 their unequaled facilities restricts the cost of production to the lowest figure consistent with the high standard of 
 excellence which is always maintained. 
 
 1 
 
THE EDISON LIGHT. 
 
 The light which is produced by an Edison lamp at the rated illuminating intensity is perfectly steady, clear, bright 
 and beautiful. Not the slightest variation or quiver is perceptible, but the light emitted is as steady as sunlight on a 
 cloudless day. 
 
 ISOLATED PLANT EQUIPMENT. 
 
 Plants for lighting separate buildings are sold outright and no royalty for their use exacted. The various sizes at 
 present manufactured are as follows : 
 
 25 Light, 16 Candle Power each. 150 Light, 16 Candle Power each. 300 Light, 16 Candle Power each. 
 
 50 " " " " " 200 " " " " " 400 " " " " 
 
 75 " " " " " 250 " " " " " 500 " " " " " 
 
 100 " 
 
 The standard equipment consists of a dynamo machine, with regulator to control the intensity of the current, an 
 ampere meter to measure the quantity of current in use, an indicator to show the pressure of the current, and a full com- 
 plement of lamps and sockets. This does not provide for wire and the various appliances connected with the system of 
 distribution, nor for fixtures, as the conditions existing in each case can alone determine the extent and character of the 
 requirements. 
 
THE EDISON LAMP CO.'S FACTORY, NKWAl 
 
EDISON LAMP PATENTS. 
 
 No. 223,898, Jan. 27, 1880. 
 " 227,229, May 4, 1880. 
 " 230,255, July 20, 1880. 
 " 251,540, Dec. 27, 1881. 
 " 251,554, Dec. 27, 1881. 
 " 251,596, Dec. 27, 1881. 
 
 No. 264,698, Sep. 18, 1882. 
 " 264,737, Sep. 19, 1882. 
 " 265,311, Oct. 3, 1882. 
 " 265,777, Oct. 10, 1882. 
 " 266,447, Oct. 24, 1882. 
 " 317,631, May 12, 1883. 
 
The standard Edison lamp is rated to give sixteen candle power of illumination. Lamps of different candle power 
 are made, all of which will burn on the same circuit. The sizes now made are : 
 
 10 Candle Power. 20 Candle Power. 50 Candle Power. 
 
 i3 " " 24 " " 100 " 
 
 16 " " 32 " • 150 " 
 
 The ten-candle power lamp ifl extensively used, and is found generally to give a more effective illumination than 
 the ordinary gas burner. By reference to the illustration of the lamp, it will be seen that the various parts are fully 
 covered by patents. Despite this, there are some companies making and selling the Edison lamp. No incandescent 
 lamp, different from the Edison lamp, has ever been in commercial use. It is by no means a reasonable assumption 
 that the Edison lamp can be manufactured by any one better than by the manufacturers, who have given this branch of 
 the industry their unremitting attention from its inception. The only difference between the Edison lamps, as manu- 
 factured in the Edison factory, and those manufactured elsewhere, is that the filament in the lamp made by the Edison Co. 
 is made of bamboo, while in the others various materials are used. Hundreds of different substances were carbonized by 
 Mr. Edison in his early experiments ; in fact, almost every known substance which could be conveniently submitted to 
 the process, and in no case were such satisfactory results secured as with bamboo. The durability of the lamp, the 
 amount of power required to sustain it, and its liability to become dimmed by use, are the important points to be consid- 
 ered in judging of its commercial value. No lamp has ever been made which will equal those manufactured by the 
 Edison Co. in these respects. These lamps are made with reference to the most economic results. If the lamp is made 
 
so as to require less power, the durability of the lamp is sacrificed, and its tendency to blacken with use is increased. 
 The most extensive experiments prove that the point of economy is eight standard lamps to the horse-power, and at 
 that economy they will last longer, and the tendency to blacken be less than at any other point. This has not been 
 shown simply in the laboratory, but is the verdict of the users of over 500,000 lamps doing actual lighting service. Noth- 
 ing but absolute ignorance of the subject can excuse the claim that better results are secured, for no opportunity has existed 
 for tests to be made in comparison with the unequaled field afforded in the hundreds of thousands of Edison lamps 
 in use. If any real improvement on the Edison lamp is ever invented, which increases its efficiency or durability, it will 
 be of more value to those who have a right to apply it than those who have not. Upwards of two thousand lamps 
 per day are manufactured at the Edison lamp factory, and a series of tests and experiments unremittingly conducted, 
 with a view of improving the methods of manufacture and sustaining the standard of lamps made. 
 
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 THE EDISON MACHINE WORKS, NEW YORK. 
 
THE DYNAMO. 
 
 The efficiency of the Edison dynamo is ninety-six per cent. That is, 
 this percentage of the power delivered at the dynamo machine is con- 
 verted into electrical energy. No higher efficiency is obtained by any 
 dynamo machine manufactured, and the limit of possible improvement 
 can be said to have been attained in these machines. They are carefully 
 constructed of the best obtainable metal, and every part is subjected to a 
 thorough test. The bearings are ample in dimensions, thus assuring no 
 trouble with heating; all electrical connections firmly secured, and every 
 part made and fitted in such manner as to form a perfect piece of mechan- 
 ism in every detail. The depreciation on the Edison dynamo machine is 
 practically nothing. The commutator and brushes, the only parts subject 
 to wear, will, with proper care, last for years. The machines are hand- 
 somely finished with hard wood switch-boards, mounted with polished 
 nut al connections. The regulator, ampere meter and indicator are 
 absolutely accurate in recording and controlling the current, as to quan- 
 tity and pressure, and are tastefully and substantially constructed 
 
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APPLIANCES. 
 
 DOUBLE POLE SWITCHES. 
 
 U. S. LETTKUS PATENT, 
 No. 839,298, April 6th, 1886. 
 
 The " Double Pole " switch is so arranged as to break both poles of the 
 eireuit at the same time. The importance of this cannot be overestimated, as 
 it is the only method of positively breaking the circuit. If only one pole is 
 broken, crosses or leaks are apt to exist, and there is no assurance that a fire 
 will not be induced. Safety devices and circuit-controlling devices, which act 
 upon both poles simultaneously, are^bsolutely essential to any system of dis- 
 tribution, and no method can be secure unless so constructed. Switches are made 
 of all sizes, suitable for controlling from one lamp to three hundred lamps. 
 
 10 
 
DOUBLE POLE SAFETY DEVICES. 
 
 U. S. LETTERS PATENT, 
 No. 314,582, March 31st, 1S85. 
 
 The object of the safely catch is to prevent undue heating of the conductors, which may result from accident or 
 poor contact, and which would in most cases be likely to produce a fire. The double pole cut-out controls this absolutely, 
 and with this device the possibility of fire cannot exist. Small fusible lead wire is interposed in each pole through the 
 medium of a ''plug " containing properly arranged contact points, and when, from any reason, the temperature of the 
 conductors is raised, the small lead wire is harmlessly volatilized, and the current absolutely shut off. 
 
 11 
 
FIXTURES. 
 
 The completeness of our fixture department compares most favorably with the most extensive manufactories of gas 
 fixtures in the country. The construction and design of the fixtures are highly artistic, or plain and substantial, as may be 
 required. 
 
 The production of fixtures suitable for supporting the Edison lamp, meeting at once the artistic and electrical con- 
 ditions required to bring the system into general use, was one of great intricacy. The combination of gas and electric 
 light fixtures in one structure was found necessary, and the devices invented to meet these demands are numerous and 
 effective. The insertion of an insulating joint, which provides for the flow of gas into the pipes of the fixture, and at the 
 same time electrically insulates the structure from the gas pipes, is an absolute essential to such a combination. 
 
 Numerous other devices providing for the wiring, suspension, insulation, and arrangement of fixtures, were invented 
 and patented, all contributing to the perfection of the Edison system, to accomplish which required inventions at every 
 step. The unique character of the lamp affords scope for artistic arrangement impossible with any other means of light- 
 ing, so that the fixtures are more varied and beautiful in design than are gas fixtures. 
 
 The following electric light patents are owned by the Edison Co.: 
 
 248.420 Elec. Lamp Fixtures Oct. 18, 
 
 248,424 Elec. Lamp Fixtures Oct. 18, 
 
 251,553 Elec. Lamp Fixtures Dec. 27, 
 
 251,559 Extension Fixture Dec. 27, 
 
 266,701 Combination Fixture April 18, 
 
 259,235 Electrical Fixture June 6, 
 
 262,272 Extension Chandelier Aug. 8, 
 
 263,103 Electrical Chandelier Aug. 22, 
 
 263,137 Electrical Chandelier Aug. 22, 
 
 266.549 Electric Fixture Oct. 24, 
 
 266.550 Elec. Light Chandelier Oct. 24, 
 
 1881 
 
 275,749 
 
 1881 
 
 286,350 
 
 1881 
 
 293,553 
 
 1881 
 
 294,697 
 
 1882 
 
 297,269 
 
 1882 
 
 305,200 
 
 1882 
 
 307,879 
 
 1882 
 
 311,131 
 
 1882 
 
 337,199 
 
 1882 
 
 337,296 
 
 1882 
 
 337,336 
 
 Connecting Plug April 10. 1883 
 
 Stand Lamp Oct. 9, 1883 
 
 Combination Fixture Feb. 12, 1884 
 
 Combination Fixture Mch. 4, 1884 
 
 Elec. Light Fixture April 22, 1884 
 
 Reflector Sept 16. 1884 
 
 Combination Fixture Nov. 11, 1884 
 
 Combination Fixture Jan. 20, 1885 
 
 Extension Chandelier March 2, 1886 
 
 Elec. Light Fixture March 2, 1886 
 
 Shade March 2. 1886 
 
 12 
 
ECONOMY. 
 
 The economy of the Edison system depends so much upon the conditions under which it is operated that no definite 
 standard figures as to cost can be given. We have testimonials showing that the cost in some places is less than an equiv- 
 alent of ten cents per thousand feet for gas, and in some cases it is as high as three dollars per thousand. The items of 
 cost in running a plant are, first, attendance; second, power, oil and waste; third, renewal lamps. In manufacturing 
 places, and where engineers are employed, the cost of attendance can be left out entirely, as the work of caring for a plant 
 is trivial, and any engineer can run it. The cost of power varies according to conditions under which it is produced. The 
 cost of lamps is eighty-five cents each, and as they are guaranteed 600 hours, the cost is y 8 5 s 5 of one cent per hour per lamp. 
 The expense then of operating an Edison plant depends entirely upon the facilities already existing, and the amount of 
 illumination required. It is a safe assumption that it will pay to put in the Edison light wherever the cost of present arti- 
 ficial lighting is, say, three hundred dollars per annum and over. In manufacturing establishments and places where 
 steam is employed particularly is this so, though where an investment in boiler andeugine and the employment of special 
 engineer is necessary, the lighting requirements should be greater, in order to economically use the Edison system. 
 
 
TESTIMONIALS. 
 
 The unqualified praise bestowed by the users of the Edison light, and its wide adoption for all classes of lighting, is 
 strong evidence in support of all claims made for it. We append a few of the very many testimonials which have come to 
 us unsolicited. 
 
 ERBEN, SEARCH & CO., WORSTED MILLS, PHILA- 
 DELPHIA, PA. 
 
 " It works to our satisfaction, and Is more economical than 
 gas under any aspect that it can be viewed, while for all-night 
 work the saving is a small profit in our manufacturing 
 business. 
 
 " We could not afford to be without it." 
 
 PARKMOUNT COTTON AND WOOLEN MILL, PHILA- 
 DELPHIA, PA. 
 
 " The guarantee you made as to power Is more than borne 
 out in practice." 
 
 OKANGE COUNTY WOOLEN MILLS, NEWBURGH, N. Y. 
 
 Mr. James Harrison writes : 
 
 "The light Is better and cheaper than gas, and absolutely 
 
 safe as to fire. I expect the difference in insurance rates will 
 pay the whole expense inside of two years." 
 
 CLARK & KEEN, WORSTEDS, PHILADELPHIA, PA. 
 
 " Our saving from use of electricity on the Edison system, 
 over our gas bills, will in the first year repay the cost of your 
 whole plant." 
 
 "This shows an average life of our lamps at this estab* 
 lishment of 3,886. hours, being 3,886 hours In excess of our 
 guarantee." 
 
 DA VOL COTTON MILLS, FALL RIVER, MASS. 
 
 "A careful test by indicator, made September 6th, with 818 
 lamps running fully up to candle power of the lamps (16 C. P.), 
 gave us an amount of power used. 84.9 horse-power, an average 
 of 9.12 lamps per horse-power." 
 
 " WC are fully satisfied as to cost, quality and quantity 
 of light." 
 
 14 
 
WAMSUTTA COTTON MILLS, NEW BEDFORD, MASS. 
 
 Edward K 11 burn, Agent, writes: 
 
 " Charging everything to this light that I can charge, I believe 
 It to be more economical Mian gas at one dollar per thou- 
 sand feet, and a very much better light." 
 
 JOHN B. STETSON & CO., HAT MANUFACTURERS, 
 PHILADELPHIA, PA. 
 
 " From our late testa we find It to cost us, as near as we can 
 Calculate! 38 per cent, of what gas would cost us at 81.90 
 per 1,000 feet." 
 
 AVERY'S AGRICULTURAL IMPLEMENT MANUFAC- 
 TORY', PEORIA, ILLS. 
 
 " We know Of no artificial light we would exchange it 
 for." 
 
 THE UNITED STATES ROLLING STOCK CO., CHICAGO, 
 ILL., MACHINE SHOPS. 
 
 General Master Mechanic writes: 
 
 " I would most gladly recommend the Edison Electric 
 Light for any and every body's use." 
 
 CONGLOMERATE MINING CO.'S MINE, LAC LA BELLE, 
 MICH. 
 
 "The Edison Electric Light has been very satisfactory and 
 economical. The cost of lighting the Mill from November, 1883, to 
 November, 1884, was £4,120.00 or about one-half the cost of 
 lighting with kerosene." 
 
 MERRICK THREAD WORKS, HOLYOKE, MASS. 
 
 " We put the system in our smallest mill (4,000 spindles) on 
 trial, and after six months we estimate that in one year the sav- 
 ing, as compared with cost of illumination by gas, would be suffi- 
 cient to pay for the original cost of plant and installment, 
 
 and leave a respect able margin besides." 
 
 Baaaoh Ubnu 
 
 FULTON IRON AND ENGINE WORKS, DETROIT, 
 MICH. 
 
 •' We run our engine to drive the light from the same boiler 
 that is used to furnish steam for a larger foundry engine and for 
 heating, and we do not notice any difference in the fuel 
 used." 
 
 15 
 
WINONA FLOUR MILLS, WINONA, MINN. 
 
 " We regard it as perfectly safe, much more so than gas or 
 (dosed lanterns, for It is simply imposaltale to fire a building, 
 
 or cause one of the (much to be dreaded) explosions that flouring 
 mills are liable to when lights are carelessly used." 
 
 ANCHOR MILLING CO.'S FLOUR MILLS, ST. LOUIS, MO. 
 
 " It is reliable, cheap and safe, and we would not go back 
 to gas light for any consideration." 
 
 BAY STATE SUGAR KEFINERY, BOSTON, MASS. 
 
 "We take pleasure in Btatlng that as we use it, it is not only 
 much more economical, but much more satisfactory than 
 gas." 
 
 HARRISON, HAVEMEYER & CO., SUGAR REFINERY, 
 PHILADELPHIA, PA. 
 
 " We find an economy in your system of lighting, compared 
 with the use of gas as supplied by the City of Philadelphia, 
 amounting to about 33%, 1. e., we have a better lighted house 
 than when using gas, at hut two-thirds of the expense." 
 
 "We find our average lamp life to be 1,396 hours." 
 
 BALTIMORE TWINE AND NET COMPANY, BALTI- 
 MORE, MD. 
 
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 " We do not hesitate to say that it costs about the saun- 
 as though gas were furnished at 60 cents per thousand." 
 
 STEA1SNS MFG. CO. MACHINE SHOPS, ERIE, PA. 
 
 " We have saved at least $100 per month during the winter 
 season by its 086, and when running all night in good times the 
 saving is greater." 
 
 THE NATIONAL MFG. CO., THREAD MILLS, NASH- 
 YILLE, TENX. 
 
 "1 believe It to be the cheapest light for practical use 
 known; to say nothing Of its superiority as an illuminator, its 
 lack of heat and entire safety as to Are." 
 
 " Your plant replaced the Brush Arc system with US." 
 
 CRACKER BAKERY, E. .J. LARRABEE & CO. 
 
 N. Y. 
 
 ALBANY, 
 
 "We like the light very much, and it Is much more econom- 
 ical than gag; it burns very steadily, no dickering ; i.-> decidedly 
 more convenient and much safer than gas." 
 
 16 
 
ARKANSAAV OIL CO., TKXAISK AN A, KAS. 
 
 "It more tlian repays its cost from the security it afTdnis 
 against Che danger of Are." 
 
 M We take pleasure In contributing our testimonial and recom- 
 mendation of the Edison Incandescent light as being, in oar esti- 
 mation, perfection for the uses and purposes Intended.'" 
 
 INSTITUTION FOB THK EDUCATION OF THE DEAF 
 AND DUMB, JACKSONVILLE, ILL. 
 
 "Our electric light is giving us as Dearly ported satisfaction 
 as any human device can." 
 
 UNIVERSITY OF THE STATE OF MISSOURI, COLUM- 
 BIA, MO. 
 
 " So well pleased are we that we mean to extend ybur system 
 of lighting still further, to the weii nigh complete exclusion of all 
 
 other modes of illumination from the buildings." 
 
 COLUMBIA COLLEGE LIBRARY, NEW YORK CITY. 
 
 M We always recommended the Edison light very Btrongly to 
 other libraries who make inquiries as to the best system to 
 
 adopt. " 
 
 MISSOURI INSTITUTION FOR THE EDUCATION OF 
 THE DEAF AND DUMB, FULTON, MO. 
 
 "We find it Far superior togas, and would not willingly return 
 to our old system of lighting." 
 
 MILLER SCHOOL, CROZET, V \. 
 
 "It costs us less than four-tenths of a cent for one slxteen- 
 eandle power light for one hour.' 
 
 MILWAUKEE ASYLUM FOR THE INSANE, WANWA- 
 TOSA, AVIS. 
 
 "It has given gOOd satisfaction all the time and we cannot 
 speak too highly of it." 
 
CENTRAL STATION PLANTS. 
 
 The problem of furnishing electric light to small consumers by distributing from a central source of supply was, at 
 the time Mr. Edison asserted he could accomplish it, looked upon as a chimerical dream. The most positive and em- 
 phatic refutation of Mr. Edison's assertions were made by scientists, and even after the first lighting district in New York 
 City was started and in operation, public assertions were made through the press that the whole scheme was a failure: 
 that half the current generated was lost by leakage; that the effect to carry the current underground was utterly imprac- 
 ticable, &c, &C., all of which proved that the critics knew absolutely nothing of the subject. The Edison Co. now have 
 stations in the following cities and towns, and are supplying electric light in private residences, stores, theatres, hotels, 
 streets, and to all who want it, at prices much lower than gas was furnished prior to starting the Edison stations. 
 
 11) 
 
EDISON CENTRAL STATION ILLUMINATING COMPANIES IN THE UNITED STATES. 
 
 Name of City or Town. 
 
 New York 
 
 Lawrence 
 
 Brockton 
 
 Sliamokin 
 
 Sunbury 
 
 Fall River 
 
 New burgh 
 
 Tiffin..... 
 
 Hazleton 
 
 Williamsport... 
 Mount Carmel. 
 Middletown .... 
 
 Piqua 
 
 Bellefonte 
 
 Circleville 
 
 Appleton 
 
 Cumberland .... 
 
 Ashland 
 
 Des Moines 
 
 Harrisburg 
 
 Lockport 
 
 York 
 
 State. 
 
 New York 
 
 Massachussetts. 
 
 a 
 
 Pennsylvania.... 
 
 Massachusetts. 
 
 New York 
 
 Ohio 
 
 Pennsylvania.... 
 
 Ohio. 
 
 Carried forward. 
 
 Pennsylvania , 
 
 Ohio.." 
 
 Wisconsin 
 
 Maryland 
 
 Pennsylvania. 
 
 Iowa 
 
 Pennsylvania. 
 New York. ... 
 Pennsylvania. 
 
 No. of Lamps. 
 
 13,000 
 4,000 
 3,200 
 4,000 
 3,500 
 4,000 
 4,000 
 •2,000 
 3.075 
 5.000 
 
 800 
 1,750 
 1,800 
 1,600 
 2,700 
 1,000 
 2,200 
 3,200 
 3.200 
 6,300 
 
 700 
 1,600 
 
 7:!. (125 
 
 Name of City or Town. 
 
 Brought forward. 
 
 West Chester 
 
 Tamaqua 
 
 McKeesport 
 
 New Brunswick 
 
 New Bedford 
 
 Johnstown 
 
 Wilmington 
 
 Reading 
 
 Chester 
 
 Lebanon 
 
 Jackson 
 
 Erie 
 
 Boston 
 
 Detroit 
 
 Atlantic City 
 
 Topeka 
 
 Amsterdam 
 
 Wayne 
 
 Laramie City 
 
 Rochester 
 
 Lancaster 
 
 Little Falls 
 
 State. 
 
 Pennsylvania. 
 
 New Jersey. ... 
 
 Massachusetts. 
 Pennsylvania.. 
 
 Delaware 
 
 Pennsylvania.. 
 
 Total Lamps. 
 
 Michigan 
 
 Pennsylvania. . 
 Massachusetts. 
 
 Michigan 
 
 New Jersey. ... 
 
 Kansas 
 
 New York. . .. 
 Pennsylvania.. 
 
 Wyoming 
 
 New York 
 
 Pennsylvania.. 
 New York 
 
 No. of Lamps. 
 
 73,635 
 
 1.900 
 1,700 
 1,900 
 1,600 
 
 1.600 
 1,200 
 1.200 
 1,600 
 1,000 
 1,400 
 1,600 
 1,000 
 2,: '.00 
 10,000 
 
 1,800 
 
 4,800 
 
 1,600 
 
 BOO 
 
 3,200 
 6.000 
 
 6.000 
 1.200 
 
 130,225 
 
 20 
 
EDISON MUNICIPAL, SYSTEM. 
 
 The Edison municipal system is intended strictly for street lighting. Dynamos of two sizes only are now made. 
 namely, for 160 lamps of Hi-candle power, and for 40 lamps of 10-candle power. Municipal lamps of 24, 32 and 50-candIe 
 power are made and can lie used on the same circuit. For general city lighting, this system is by far the best and most 
 economical method, and wherever it is in use the most satisfactory results arc obtained. The cost of wire in this system is 
 inconsiderable, and a plant of 1G0 16-candle power lamps, sufficient to light an ordinary town, can be equipped without 
 power with but a small investment of capital. Smaller machines will be shortly manufactured, so that public lighting 
 on the smallest scale will lie practicable and profitable. 
 
 ESTIMATES OF COST. 
 
 In sending for estimates, please furnish the following information: 
 How much boiler power, if any. is available to run dynamo? 
 How much power in engine, if any. is available to run dynamo? 
 
 How many buildings are required to be lighted, how many lamps in each building, and what are the relative posi- 
 tions of buildings with respeel to intended location of dynamo? 
 Are any special fixtures required other than plain pendants? 
 
 21 
 
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MENLO PARK"— THE BIRTHPLACE OF THE INCANDESCENT LIGHT.