lf6j 



SCIENCE 



New Series. 

 Vol. IX. No. 215. 



Friday, February 10, 1899. 



Single Copies, 16 CTs. 

 Annual Sobsckiption, $5.00. 



QUEEN 



STAINDARDS OR RESISTAINCE 



To no branch of the instrument business have we given more attention than to the pro- 

 duction of Standards of Kesistauce. 



A completely equipped testing laboratory is devoted exclusively to resistance work. It is 

 free from vibration and external influences and its temperature entirely under control. Our 

 facilities and experience enable us to secure results of the highest accuracy, and the constant 

 verification of our standards warrants us, in claiming for our comparisons, absolute reliability. 

 Send for descriptive circular, No. 254. 



SENT ON APPLICATION 



Catalogue T Electrical Test Instruments 



Catalogue I Physical Apparatus 



Catalogue 1=20 Physical Laboratory Supplies 



Catalogue U90 Commercial Electrical Instruments 



Circular 214 Lord Kelvin's Electrical Instruments 



Circular 244 Cable Testing Apparatus 



Circular 264 Queen X=Ray Apparatus 



Circular 364 The Queen- Acme Testing Set 



120 pages 

 1 50 pages 

 180 pages 

 48 pages 

 20 pages 

 40 pages 

 24 pages 

 20 pages 



QUEEN & CO., INC. 



NEW YORK BRANCH : 



59 Fifth Avenue 



Electrical and Scientific Instrument Works 



1010 Chestnut St., Philadelphia, u.s.a. 



