American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 115
ARRESTER ON SWITCH-BOARD. This combination arrangement of fuse and ground plate, shown in Fig. 70, orModifications of it, is now almost invariably used in cable boxes and cablehouses, and on the cupolas of telegraph offices, and it is being extensively introducedon switch-boards. The wire used has… … to No. 32 or No. s^ B. w. G. A mil is the one thousandth of an inch. The bindingscrews b s, to which the fine wire is attached, are specially constructed to hold thewire without injury. These screws have double connections, one for the line wire LIGHTNING ARRESTERS, 87 proper at x, on the main body…
Telegraph
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