SCIENCE 



New Series. 

 VOL. V. No. 114. 



Feiday, March 5, 1897. 



Single Copies, 15 CTS. 

 Annual Subscription, 85.00. 



Ziegler Electric Company, 



(Established 1882. 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 



APPARATUS, 

 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. 



