Amateur mechanics ... a book for old and young who like to make things .. (1907)
Popular mechanics magazine, Chicago. [from old catalog] · Chicago, Popular mechanics · leaf 54
f 3,000 ft. The transmitterconsists of an induction coil, about thesize used for automobiles, a key or pushbutton for completing the circuit andfive dry batteries. The small singlepoint switch is left open as shownwhen sending a message, but whenreceiving it should be closed in orderthat the… … nary telephone receiver is connected inseries with the coherer, as show-. Treceive messages hold the receiver tothe ear and close the switch and an-swer by opening the switch and operat-ing the kev.—Contributed bv CoulsonGlide, 816 X. Temple Ave., Indian-apolis, Ind. Constant Pressure Hydrogen…
Handicraft · Amusements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
