SCIENCE 



Friday, May 11 , 1900. 



SINGLE Copies, IB cts. 

 Annual Subsceiption, $6.00 



QUEEN INSTRUMENTS 



New 



Queen Wall Pattern 



Galvanometer 



The Moving Coil in this Qalvanom r is of small diameter and light weight. It can be 

 made dead beat and will then give readings with much greater rapidity than other forms on 

 the market. When arranged for Ballistic work the period of swing can be made as desired. 



Physical Apparstus lNDUCTio?< Cons • Electrical Testing Instrubiewts 



QUEEN & CO., Inc. 



J. G. GRAY, President 



ELECTRICAL AND SCIENTIFIC INSTRUMENTS 



59 Fifth Avenue, New York t^t^ /-», , , /-», !->■ ■• i ■ ■ • 



480 Monon Bidg., Chicago 1010 Chcstnut St., Philadelphia 



