The Boston school compendium of natural and experimental philosophy .. (1837)
Parker, Richard Green, 1798-1869 · Boston : Marsh, Capen & Lyon · leaf 169
is the glass plate,(which in some machines is a hollow cylinder,) from which theelectricity is excited, and H is the handle by which the plate (or cyl-inder) is turned. R is a leather cushion, or rubber, held closely toboth sides of the glass plate by a brass clasp, supported by the postG L, which… … to the legs L L and the fork F of the prime conductor. C is theprime conductor, terminating at one end with a moveable brass ball,B, and at the other by the forkF, which has one prong on each sideof the glass plate. On each prong of the fork there are severalsharp points projecting towards the…
Physics
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