ector is shown diagramma- Fessenden employs a_ lightning tically in Fig. 1, and is called a “cur- arrester, formed of filings made rent-actuated, wire-responsive from an alloy of 95 per cent of gold device.”’ It consists of a silver wire and. 5 per cent bismuth, placed be- one-tenth of an inch in… … the apparatus of its com- bent into a U-shaped plementary station. When loop, Fig. 1, and its termi- sending, the two circuits nals attached to the lead- are operated in parallel. ing-in wire, 2; the tip of The accompanying pho- the U-loop is immersed in tographs show the practi- nitric acid and…
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