496 J. W. Fewkes—Brush Discharge from the Holtz Machine. 
No. VIIL—Effect of Condensers on the Brush Discharge from 
the Holtz Machine; by J. W. FEWKEs. 
THE readiest way of producing the brush discharge is to con- 
nect the negative conductor of the Holtz machine with the 
_ With large condensers the brush changes into a glow on the 
knob of the positive conductor. It will be instructive to quote 
