The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 130
g. 103.—Scale £ SUB-STATION APPARATUS 107 Terminal Block.—To meet the requirements mentionedabove, the terminal block shown in Fig. 106 is used. Thiscombines a safety guard for each of the cases mentioned. The lightning arrester consists of two carbon blocks separ-ated by a piece of mica, of the… … Fig. 107.—Scale i Fig. 108.—Scale £ globule of easily fusible metal in the centre, as shownat K in Fig. 108 (which is a sectional view of one sideof the terminal block), which, with prolonged sparking, dueto contact with high-tension-current systems or lightning,melts, and joins the two blocks…
Telephone
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