Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 83
ctor shew stars of white light. The effect of points in discharging electricity may beillustrated in various ways. Thus with a given machine inits normal state it may be possible to draw sparks an inch ormore in length; if a fine point be affixed to the conductor thelength of spark is reduced to a… … Fig. 35. The electric windmill is another example of the action ofpoints. A number of pins with their points turned in thesame direction are attached like the spokes of a wheel to asmall central cup and balanced on a pivot connected with theconductor of an electrical machine; on working the…
Electricity · Magnetism
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