March 15, 1889.] 



SCIENCE. 



C. & C. ELECTRIC MOTOR COMPANY. 



Electric Motors 



FOR 



Arc and Incandescent Cir- 

 cuits, Most Economi- 

 cal Motor on the 

 Market. 

 Regulation Perfect. 

 Motors Designed for all 

 Power Purposes. 



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. 



Schools. 



New Jersey, Plainfield. 



'pHE CHESTNU I'S.-Parents with daughters toedu- 



^ cate, or orphan girls with companion, may find a 



<:omfortable home, with school instruction by applying to 



Miss E. E. Kenyon. 



Connecticut, New Haven, 



MRS. CADY'S SCHOOL FOR YOUNG LADIES. 

 Prepares for Smith and Wellesley, and admits to 

 Vassar by Certificate. Circulars. Early application 

 necessary. 



Vermont, Burlington. 



VERIWONT EPISCOPAL INSTITUTE. Boarding 

 School for Boys. Prepares for College or Business. 

 Military drill. Terms moderate. Fifty-seventh half- 

 year opens September 3, 188S. Send for catalgue. 



H. H. ROSS, A.M., Principal. 



Ha 



Ind. 



■D OSE POLYTECHNIC INSTITUTE.-A School 

 ^^ of Engineering. Well endowed,weIl equipped depart- 

 ments of Mechanical and Civil Engineering. Electricity, 

 Chemistry, Drawing. Extensive Shops & Laboratories. 

 Expenses low. For catalogue address T, C. Mendenhall, 

 Pros. 



Brokers and Auctioneers. 



R. ELLIS & CO. 



BUSINESS, HOTEL AND PATENT BROKERS, 

 3, ETC. 



JVo. 176 BRO»finW^r', 



Room 46. 



.Veiv JTorh 



Advised jfi-ee oy charge. 



Scientific Apparatus. 



J. GRUNOW 



621 Sixth Avenue, Ne 



Established 1852. 



Microscope Stands, 

 Oil Immersion Object- 

 ives and Abbe Con- 

 densers for Bacterial 

 and Histological work, 

 of Objectives, Camera 

 Lucida and other ac- 

 cessory apparatus. 



ff.H.WALMSLEY&CO. 



SUCCESSORS TO 



R. & J, BECK, 



1016 Chestnut Street Phiia 



Microscopes and all 

 Accessories and Ap- 

 paratus. Photograph- 

 ic and Photo-Micro- 

 graphic Apparatus and 

 Outfits. 



Spectacles, Eye 

 Glasses, Opera and 

 Marine Glasses, etc. 



Illustrated Price List 

 mailed free to any ad- 

 dress. Mention Science 

 in corresponding with us. 



IMPROVED OIL LIGHT 



MAGIC LANTERNS. 



Also Lime and. Electric Light Apparatus, and 



mechanical, plain, and fine colored views. 



J. B. COLT & CO., Manufacturers, 



No. 16 Bkekman Street, New York. 



MAGIC Stereopticons and the Best Views 



, ,";f:^tr.,^ for PubHc, church, Home, and 

 LANTERNS Scientific Exhibitions. Best appa- 

 ratus, new views. Largest stock. Reduced prices. 24 

 Years' Practical Experience. Illus. Catalogue Free. 



GEO. H. PIERCE, 

 136 S. Eleventh St., Philadelphia, Pa 



J. p. TRAVER & CO., 



General Auctioneers, 



Real Estate and Business Brokers, 



OFFICE, 23 PARK ROW, 



Oppc^ite Post Office, (Rooms r4 »& 15.) New York. 



Mortgages Foreclosed, Casli Advanced on Consignments. 



Readers of Science 



Corresponding with or visiting Advertisers 

 will confer a great favor by mentioning the paper. 



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- 

 mined. 



Insulation of Cables and Wires Tested. 



Etc., Etc. 



Circulars describing Methods Used, Prices, 

 Etc., sent on Application. 



Address as above. 



E. & H. T. ANTHONY & CO. 

 5131 Broadway, N.Y. 



Manufacturers and Importers of 



PHOTOGRAPHIC INSTRUMENTS, 



Apparatus and Supplies of every 



description. Sole proprietors of 



the Patent Detective, Fairy, Nov- 



t el, and Bicycle Cameras, and the 



.... 1 Celebrated Stanley Dry Plates. 



Amateur Outfits in great variety, from $9.00 upward. 

 Send for Catalogue or call and examine, 

 than 40 years established in this line of busin< 



WHITALL'S PLANISPHERES OR DI- 

 RECTORY OF THE STARRY HEAVENS 

 name and locate all Stars, Constellations, and 

 Planets visible at any given minute of time. 

 Should be used by every one. Ask your sta- 

 tioner, or address Wm. T. Cooper, Manager, 

 307 Race St., Philadelphia, Pa. 



SCHOOLS AND COLLEGES 

 will have a positive advantage by ordering their furniture 

 apparatus and supplies from C.PARDO & CO., 



31 East 17th St., New York. 



TO EMPLOYERS. 



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

 the NEW YORK EMPLOYMENT BUREAU, at No. 

 681 BROADWAY, in this city, we request the pat- 

 ronage of the public In the future. We desire to 

 All a long-felt want for an employment bureau, 

 where only the best grade of male help is dealt in, 

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

 dered in every instance, and our patrons can rely 

 on us to send strictly flrst-class help, the references 

 of whom we personally investigate before sending 

 to any one. We simply request a trial, and are con- 

 vinced that we will give sailsf action in every case. 

 We have on hand help in every branch, which we 

 can send upon receipt of telegram or letter, AND 

 FOR WHIUH WE MAKE NO CHARGE TO AN EM- 

 PLOYER. 



NEW YORK EMPLOYMENT BUREAU, 



(AS REOKGANIZED). 



