The standard electrical dictionary; a popular dictionary of words, terms, and phrases, used in the practice of electrical engineering (1897)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, H. W. Henley & co. · leaf 411
Variouskinds of electric pens have been invented. One kind, invented by 406 STANDARD ELECTRICAL 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… … 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 the…
Electricity
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