American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 114
ated by a small airspace having high resistance.The intention is that when the line is highly charged by lightning the electricity will LIGHTNING ARRESTERS. 85 jump over this short air space of high resistance in preference to following the, elec-trically, shorter route to earth through the… … In other forms of lightningarresters, the line strips, as indicated in Fig. 67,are placed upon a ground strip with only thin layers of parrafin paper interven-ing. In this form the lightning discharge, in passing to the earth, ruptures the par-rafin paper. The manner in which the plates are…
Telegraph
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