April 5, 1889.] 



SCIENCE. 



C. & C. ELECTRIC MOTOR COMPANY. 



Electric Motors 



FOR 



Arc and Incandescent Cir- 

 cuits, Most Economi- 

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 Market. 

 Regulation Perfect. 

 Motors Designed for all 

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OFFICE and MANUFACTORY: 



402 and 404 Greenwich Street, New 

 York Citv. 



New England Office, 19 Pearl St,, Boston. 



Philadelphia Office, 301 Arch St. 



Western Office, 139-141 Adams Street 

 Chicago. 



Southern Office, 25 Carondelet Street, 

 New Orleans. 



THE 



Aiiiericaii M Tifkiie 



COMPANY. 

 95 MILK ST,, BOSTON, MASS, 



This Company owns tlie Letters 

 Patent granted to Alexander CJra- 

 liani BeU, March 7th, 1876, No. 

 174,465, and January 30, 1877, 

 No. 186,7§7. 



The Transmission of Speech hy 

 aU known forms of ELECTRIC 

 SPEAKING TELEPHONES in- 

 fringes the right secured to this 

 Company by the above patents, and 

 renders each individual user of tel- 

 ephones, not furnished by it or its 

 licensees, responsible for such un- 

 lawful use, and all the conse- 

 quences thereof and liable to suit 

 therefor. 



ESTERBROOK'S 

 STEEL PENS. 



OF SUPERIOR AND STANDARD QUALITY. 

 Leading Nos.: 048, 14, 130, 135, 239, 333 



For Sale by all Stationers. 



THE ESTERBROOK STEEL PEN CO., 



Works : Oamden, N. J. -26 John St., New Voi-k. 



Old and Rare Books. 



A. S. CLARK, Bookseller, 



34 PARK ROW, NEW YORK CITY. 



A Gleaner in the By-ways of Literature, Results of Gleaning 



found in Catalogues issued from time to time, 



CATALOGUE NO. 27 NOW READY. 



JACK NUMBERS and complete sets of leading Mag- 

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H. ^VILLIAMS, 

 Dealer in Old Magazines, Reviews, &c. Scientific 

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Scientific Apparatus. 



J. GRUNOW 



631 Sixth Avenue, New V 



Established 1852. 



Microscope Stands, 

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IMPROVED OIL LIGHT 



MAGIC LANTERNS. 



Also Lime and Electric Light Afparatus, and 



mechanical, plain, and fine colored views. 



J. B. COLT & CO., Manufacturers, 



No. 16 Beekman Street, New York. 





MAGIC Stereopticons and th. 



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GEO. H. PIERCE, 

 136 S. Eleventh St., Philadelphia, Pa 



ELECTRICAL TESTING BUREAU, 



Johns Hopkins University, Baltimore, Md. 



Resistance Coils and Boxes Compared. 



Am meters and Volt meters calibrated. 



Condensers standardized. 



Primary and .Secondary Batteries Tested. 



Efficiency of Dynamos and Motors Deter- 

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Insulation of Cables and Wires Tested. 



Etc., Etc. 



Circulars describing Methods Used, Prices, 

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Address as above. 



MORRIS EARLE & CO. 



SUCCESSORS TO 



K. & J. BECK, 



1016 Chestnut Street Phiia 



Microscopes and all 

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Spectacles, Eye 

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Illustrated Price List 

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I40y 



E. & H. T ANTHONY & CO. 



591 Broadway, N.Y. 

 Manufacturers and Importers of 



PHOTOGRAPHIC INSTRUMENTS, 



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or call and exam ' 



tablished in this line of b 



WHITALL'S PLANISPHERES OR DI- 

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Readers of Science 



Corresp07idi7ig with or visiting Advertisers 

 will confer a great favor by mentioning thi paper. 



TO EMPLOYERS. 



Having purchased the fixtures, good will, &c., of 

 the NEW YORK EMPLOYMENT BUREAU, at No. 

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 and it is our aim to send ONLY such help as is or- 

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 We have on hand help in every branch, which we 

 can send upon receipt of telegram or letter, AND 

 FOR WHIuH WE MAKE NO CHARGB TO AN EM- 

 PLOYER. 



NEW YORK EMPLOYMENT BUREAU, 



(AS REORGANIZED). 



