A manual of electricity, magnetism and meteorology (1844)
Lardner, Dionysius, 1793-1859, Walker, Charles Vincent, 1812-1882 · London Longman, Brown, Green & Longmans · leaf 565
ch is separated fromthe rod by means of a piece of hard wood resting on it; the other end ofthe helices is in communication with the rod. O is an iron wire spring*to exercise a pressure against the hollow cylinder K, with which it is in * In fig. 290. a revolving wheel is introduced, instead of a… … metal spring exercising a feeble pressure on the break piece H: it is held inmetallic contact by means of a binding-screw. T is a copper wire for makingcommunication between the brass plates M N. By means of this arrange-ment, these various parts D, H, Q, P, N, are in connection with one of…
Atmospheric electricity · Electricity -- Early works to 1850 · Magnetism
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