Friday, April 13, 1900. 



Single Copies, 15 CTS. 

 Annual Sdbsceiption, $5.00 



Queen D Arsonval Galvanometer. 



Instruments 



THE NEW QUEEN 



Has the Following Points 

 Worthy of Attention 



EASE OF LEVELLING 

 HIGH INSULATION 

 SENSIBILITY 

 EXTREME SIMPLICITY 



Send for Special circulars on Photometers, 



Portable Testing Sets, Cable Testing 



Apparatus, X-Ray Apparatus 



59 Fifth Avenue, New York 

 480 Monon BIdg., Chicago 



J. G. GRAY, President 



ELECTRICAL AND SCIENTIFIC INSTRUMENTS 



1010 Chestnut St., Philadelphia 



