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Radio Record, Volume II, Issue 26, 11 January 1929, Page 5

HE arrangement of a lightning arrester is simply that of two or more metal plates connected to earth and aerial respectively, but separated by a very small air gap. The instrument is placed at the point where the aerial enters the house and the earth wire goes straight from it into the ground. If the aerial became charged during a thunderstorm the electricity would spark directly across this small gap to earth, instead of taking the comparatively much longer pathway through the receiving instrument, which would thus be protected by the provision of an alternative path outside the house.