Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 73
enough to make a sharp tick. Be sure, however, thatthe metal strip which was mounted upon the base of the key,does not touch the screw projecting through the base board.Move the key up and down slowly and adjust its movement and 58 EASY ELECTRICAL EXPERIMENTS. that of the armature by means of the… … o Connecting the Set. ^perfectly. When not in use place the metal strip on the base•of the key upon the projecting screw. The circuit will thenbe permanently closed and should always be left in this condi-tion when not in use. Otherwise the person at the other endof the line cannot call the person…
Electric apparatus and appliances · Electricity
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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