SCIENCE 



New Series. 

 Vol. XI. No. 267. 



Friday, Febehaey 9, 1900. SS"™,'™. ».«, 



Queen Portable Photometer 



-r^ n -^.'F^p:^?SxM^sm^^ 



A compact, highly portable and convenient form of PHOTOMETER designed for 

 rapid work under all conditions. 



The bellows protects the eyes from the lights. 

 Connections for Wattmeter, Voltmeter and Ammeter. 

 A direct Reading scale. Many other desirable features. 

 A special circular gives full description. 



"We direct attention to our latest forms of 



PHOTOMETERS, PORTABLE TESTING SETS, 

 CABLE TESTING INSTRUMENTS, X-RAY APPARATUS 



DESCRIPTIVE CIRCULARS FREE 

 We Make a Specialty of Testing Incandescent Lamps 



59 Fifth Avenue 



New York 



QUEEN & CO., Inc. 



J. G. GRAY, President 



Electrical and Scientific Instrument Works 



1010 Chestnut St., Philadelphia 



t-EB 1019( 



