History of Science Museum: Collection Database Search

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Technical Details

A coherer (or, sometimes, receiver) was an early form of detector in wireless telegraphy, based around the effect that small particles of metal filings stick together (or 'cohere') when an electric field is present. A coherer consisted of a basic electromagnetic wave detector for various wavelengths and a circuit that obtained signals from modulated radio waves. The coherer then 'decoded' these signals.

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