Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 169
e never attempted anythingof the kind for the receiver, although subsequent experi-ments have shown that it is a much more important featurein the latter case than in the former. iS6 ELECTRICITY IN MODERN LIFE. The first speaking telephone was the invention of Alex-ander Graham Bell, a Scotchman… … Fig. 43- The same instrument served either for transmitting orreceiving the message, and consisted of a pair of harpsformed of steel rods attached to the poles of a permanentmagnet, NS, and having their free ends respectively aboveand below the soft iron core of an electro-magnet, E. Two such…
Electric industries · Electricity
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