the Discharge of a Leyden Jar. 251 
ling or trebling its velocity made any perceptible difference. 
more natural conditions. fee 
Revolving apparatus.—The same train of toothed wheels was 
used, a double silvered mirror being now attached to the a 
axis, reckoning from that with the weight. | Its rate of revolu- 
tion could be varied from half a revolution up to three per 
