The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 411
iouskinds of electric pens have been invented. One kind, invented by 4o6 STANDARD BI^KCTRICAIv DICTIONARY, Edison, consists of a handle carrying an electric motor actuating aneedle, which is driven in and out of the other end of the handlewith high rapidity. It is used by being held vertically on… … y Fig. 256. Electric Pen. A simpler kind dispenses with the motor and depends on the per-forations produced by the electric spark. As shown in the cut thestylus is one terminal of an induction coil circuit. The supporton which the paper rests is the other terminal and must be a con-ductor. In use…
Electricity
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