Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 121
till in use on some of our railways,but they are rapidly being replaced by single-needle instru-ments, which are much more convenient. The construction of the single-needle instrument isshown in the accompanying diagrams. Fig. 23 shows afront view of the instrument with the cover and dialremoved.… … OVERLANt) TELEGRAPHS. 109 The upper portion of the apparatus, marked A in Fig.23, is the receiver. It is formed of two ivory bobbins,
Electric industries · Electricity
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