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What is a coherer?

What is a coherer? Here are some definitions.

Noun
  1. (physics) A detector of radio waves used in very early radio receivers.
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Examples
Suddenly there sounded the sharp click of the tapper as it struck the coherer.
This was in 1894, and the combination of oscillator and coherer actually formed the first real wireless set.
We now found that the coherer would respond when the spark coil was operated several feet away.
One wire from the coherer is connected to the aerial and the other to the ground.
The sensitive part of the Marconi receiving apparatus is the coherer.
The tapper then ceases to function and the coherer is ready for the next wireless signal.

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