Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 426
less Telegraphy. These experiments formthe basis of wireless telegraphy. Instead of Hertzs ring, some form of coherer is usuallyemployed as a receiver. It was shewn first by Branly that the electric resistanceof a glass tube filled with iron filings is very much reducedif electric oscillations fall… … Fig. 265. condition the coherer resistance is so large that the currentpassing is very small. When electric waves fall on it theresistance falls, and the galvanometer needle is (.leflected ; thesensitive condition is restored by tapping the board on whichthe coherer rests. 257-258] ELECTRIC WAVES…
Electricity · Magnetism
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