American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 116
he set screws. The tension is useful in that it may assist inthe disruption or separation of the wire under a strong current. This wire is knownas the spider wire. It would now be used, even if not effective as a lightningarrester, as a fuse Avire, to protect the office apparatus in the event of a… … stood that the wood-screw of b s^ is not connected with anything but the woodenbase. The ground plate e and the brass plate p correspond to tliose shown in topview, Fig. 67, the brass plates p being separated from the ground plate e by parrafinpaper. Mag^^etic lightning arrester.—Still another form…
Telegraph
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