SCIENCE 



New Series. TToTTiA-ir Taiwttatjv 19 1 QDO Single Copies, 15 CTS. 



Vol. XI. No. 263. CKLUAX, JAJNUAJiY ±Z,, lt7UU. Asnoal Subsceiption, 85.00 



NEW INSTRUMENTS FOR 1900 



The New Queen Wall Pattern Galvanometer 



is superior to existing types in Facility of Levelling ; Ecoxomt of 

 Space ; High Sensibility ; Simplicity of Design. 



The New Queen Portable Photometer 



Most Compact Photometer made. Can be adjusted for use in one min- 

 ute. Gives liighly accurate results. 



The New Queen Standard Photometers and 

 Photometric Accessories 



Ih§ Queen Induction Coils 



4-inch to 25-inch spark. In advance of any Coils made in amount of 

 energy obtained from the secondary. 



OUR FACILITIES 



have been greatly increased by the extension of our Factory and the enlargement of our 

 Electrical Laboratory, which enables us to promise prompt service and satisfactory work. 



Our New Pamphlets on Photometers, Cable Testing Apparatus, Portable 

 Testing Set, X-Ray Apparatus, sent on application. 



QUEEN & CO., Inc. 



J. G. GRAY, President 



Electrical and Scientific Instrument Works 

 59 Fifth Avenue a^^a^ ^^. . e^, i-n ■■ • • • ■ 



NewYork 1010 Chestnut St., Philadelphia 



