Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 103
carbon. The upper block is in contact with post A by a springWhich holds it in position. The lower block rests on ametal plate* which is connected to the ground wire D. When lightning or any pressure over 300 volts comeson the line it jumps across the air gap between the carbonblocks (whose length… … Fig. 35. Top view of Arrester shown in Fig. 34. This means that there is a short and low resistance pathfor the current, which lightning will follow instead of go-ing through the instruments. Should there be a cross connection with other lines or aleak to the telephone line, the instruments could…
Electricity
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