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 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 of… … To Zi/f^ magnetic^ lightning or current arrester. The line wire is connected at screwpost s^, with the ap[)aratus, wliich is mounted on a narrow base board n. Tlie screw 88 AMERICAN TELEGRAPHY. rests on a brass strip attached to the base board. A strip of brass s, hinged at P,extends to the catch c…
Telegraph
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