Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 69
theystrike the wood. The rubber band mentioned is fastened to the armature by ahook made from a pin driven through R. The other end passesthrough a hole in the post P, and is held by a peg driven intothe hole in the post. 54 EASY ELECTRICAL EXPERIMENTS. CHAP XV—HOW TO MAKE A SET OF TELEGRAPH… … ator, who works a key so-called, which is simply an instru-ment for opening and closing, with accuracy, an electric circuit.All that we shall have to do to make our set complete is to makethis key. Cut out a piece of board, 4 inches long, 3 inches wide, and Y%inch thick. Draw a line lengthwise…
Electric apparatus and appliances · Electricity
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