Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 122
OVERLANt) TELEGRAPHS. 109 The upper portion of the apparatus, marked A in Fig.23, is the receiver. It is formed of two ivory bobbins, … Fig. 25.wound with fine, silk-covered wire, and placed on oppositesides of a small magnetic needle attached to the pointer I lo ELECTRICITY IN MODERN LIFE. of the dial, and free to move within the bobbins to theright or left until arrested by the stops; one end of eachbobbin is connected to the…
Electric industries · Electricity
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