PAPERS OX CHEMISTRY AND PHYSICS 319 



The current capacity of such a battery is naturally very 

 low. It should be used primarily for potentials only, or 

 for very small currents of the order of a few milliam- 

 peres. The cells will, however, deliver about 1/10 am- 

 pere, but for a short time only, the voltage soon dropping 

 off. Cells constructed of sheet lead and formed as these 

 should be charged regularly once per week whether they 

 are used or not. For convenient charging the trays 

 should be mounted in a cupboard as described, where 

 the individual trays may be returned for charging. If 

 preferred the cuiDboard may be replaced by three cabi- 

 nets of 1000 volts each mounted on rubber tired castors, 

 thus making the battery available in different rooms. 

 University of Illinois 



Laboratory of Physics 

 April, 1922 



