National Telegraphic Union · New York : N.T.U. · leaf 336
y pattern, one of its principaladvantages being that the knob is fixed firmly in itsplace, instead of being movable, an objection to whichseveral other inventions of this kind are open. The credit of this invention is due to Mr. A. J. Gil-lespie, of Ottumwa, Iowa, from whom any further infor-mation… … stud, e, and thus maintains the finger-plate in the positionshown in the figure when the key is not in use. Thestrength of the spring, /, is adjustable at pleasure, bymeans of the screw, g. The platina point of the key,which forms the working connection, is placed upon thelower end of a pin, h,…
Telegraph
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