SCIENCE— ADVERTISEMENTS 



THE SOLUTION OF YOUR PROBLEM OF ACCURATE 

 TEMPERATURE MEASUREMENT 



Physico-chemical methods, which are becoming increasingly necessary in 

 the industrial and institutional research laboratory, often involve determina- 

 tions of temperatures and temperature differences. Transformation points ; 

 boiling, melting and freezing points ; specific heat and other calorimetric 

 determinations — their mere enumeration suggests high accuracy and high 

 sensitivity. 



THE WHITE POTENTIOMETER 



was designed to meet these requirements fully. It is indifferent to the 

 severe conditions imposed upon a delicate instrument by corrosive vapors, 

 because all contacts and other metal parts are mounted inside the case. 

 There is probably no other apparatus which will yield more dependable re- 

 sults, which will respond so readily to small temperature changes, and which 

 will remain so unaffected by long continued use under adverse conditions, 

 as a White Potentiometer equipment. 



Bulletin S726 completely describes the principle, design'and 

 method of operating the White Potentiometer. It also con- 

 tains a bibliography of the articles by Dr. W. P. White upon 

 problems of temperature measurement. This bulletin will 

 be sent upon request. 



LEEDS & NORTHRUP COMPANY 



ELECTRICAL MEASURING INSTRUMENTS! 



4901 STENTON AVENUE PHILADELPHIA, PA. 



