SCIENCE-ADVERTISEMENTS 



SCIENCE 



A WEEKLY JOURNAL DEVOTED TO THE 

 ADVANCEMENT OF SCIENCE 



Entered ii 

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An advertisement in Science reaches more com- 

 pletely and directly than is possible in any other way 

 the scientific men of the country, and those who are 

 interested in science, including many men of wealth 

 and influence. Scientific and educational books, sci- 

 entific apparatus and supplies, scientific and educa- 

 tional institutions and schools can be advertised in 

 Science to special advantage, and in the interests of 

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 the makers of their instruments and the executives of 

 institutions with which they are connected to the 

 peculiar value of Science as a medium for advertise- 

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Published every Friday by 



THE SCIENCE PRESS 



Lancaster, Pa. Garrison, N, Y. 



Sub-Station 84 : New York 



Vacuum 

 Thermo- Elements 



Made by 

 Siemens & Halske 



The Siemens & Halske Vacuum Thermo- 

 Elements.are designed for measuriDg very 

 small alternating currents, in conjunction with 

 suitable pointer or reflecting Galvanometers. 

 Sensibility is very high, and results of great 

 accuracy may be obtained by their use. These 

 instruments have been used by Public Utilities 

 and Industrial Companies, and in University 

 and College Laboratories. Shunts with several 

 ranges and multi-way switches may be supplied 

 if required. 



Write for Bulletin 335, giving full particulars. 



JAMES G. BIDDLE 



So.e U. S. Agent 



1211-13 Arch Street 

 PHILADELPHIA 



When in Philadelptiia be sure to visit our Permanent 

 Exhibit of Scientific Instruments 



