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SCIENCE 



New Series. 

 Vol. V. No. 127. 



Friday, June 4, 1897. 



Single Copies, 15 cts. 

 Annual Subscription, 86.00. 



Ziegler Electric Company, 



(Established l$S2. Incorporated 1894.) 



Physical, Scientific 



and Chemical Apparatus, 



Electrical Test Instruments, 



Optical Apparatus, etc. 



EXPERIMENTAL 



WORK EXECUTED TO 



ORDER. 



SPECIAL APPARATUS 



CONSTRUCTED 



TO SPECIFICATIONS 



AND DRAWINGS. 



PSYCHOLOGICAL 



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 TELESCOPES, 



MEASURING 



INSTRUMENTS, 



X-RAY APPARATUS, 



TELEPHONES. 



Standard Barometers and Thermometers. 

 Apparatus imported duty free, for Colleges. 



Correspondence invited. Illus. Catalogue, 240 pp. (price, $1.00), free to Teacliers of Science. 



ZIEQLER ELECTRIC COMPANY, 



LONG DISTANCE 

 TELEPHONE. 



BOSTON, MASS. 



