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The practical telephone handbook and guide to the telephonic exchange (1906)

Poole, Joseph · New York, Macmillan Co. · leaf 131

An illustration from The practical telephone handbook and guide to the telephonic exchange, 1906, leaf 131 — stantly with a current of 2J to 3 amperes. The heat coil r of Fig. 109 is of 43 ohms resistance, and iswound on a metal bobbin, M, which is joined by means offusible solder, l, to a metal stud, q, connected to the fuse f.Any current of more than \ of an ampere, passing through io8 PRACTICAL… … ,5 M R Q F Fig. 110.—Full size tects the apparatus from small currents of considerableduration. Fig. 109 gives a section of the fuse tube, and Fig.110 an enlarged section of the lower part.

Telephone

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