Coherer (source code)
= Coherer
{wiki}
A filings coherer changes from high to low <electrical resistance> following electrical excitation. A local <battery> supplies the readout <electric current>; a tap resets the detector. It records events rather than the incident <radio wave> waveform.
Marconi described nickel and silver filings between silver plugs, with a cell and sensitive <telegraph relay> controlling a tapper and recorder.<Wireless Telegraphic Communication by Guglielmo Marconi>[1909 lecture, printed p. 197, Fig. 1 and following paragraph: coherer construction and local readout]{ref}
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