Easy electrical experiments and how to make them; (1918)
Dickinson, Leonard Perley, 1874- [from old catalog] · Chicago, F. J. Drake & co · leaf 78
e used, although those who donot have access to the large cities, may find some difficulty insecuring it. It can be ordered sent by mail from any electricalsupply house and is not expensive. EASY ELECTRICAL EXPERIMENTS. 63 CHAP. XVIIX-HOW TO MAKE A SET OF TELEPHONE IN-STRUMENTS. PART ONE. On page… … I fport forcarlron is showndotted 2 tries mitten That is, a person using the instrument would talk intoand listen to the instrument alternately, no battery being re-quired for its operation. Such an instrument is, however, un-suited for lines of much length, and the purpose of this and thefollowing…
Electric apparatus and appliances · Electricity
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