Electric transmission of energy and its transformation, subdivision, and distribution. A practical handbook (1894)
Kapp, Gisbert, 1852-1922 · New York, Van Nostrand · leaf 418
had to be devised forthis purpose. The simplest and one of the most reliableis the Wirt guards which consists of a number of serratedmetallic cylinders insulated from each other and set LIGHTNING GUARDS. 399 parallel to each other in a row with very little clearance.There are generally seven of… … 1,000 volts, and for higher pressures more groups are putin series and the connections are suitably altered. Theprinciple on which this instrument is based is that theordinary power current has not a sufficient pressure toleap over from one cylinder to the other, whilst a lightningflash does so…
Electric power production
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