Chemistry, 01.12.2021 20:00 michael1295
The image below shows a coherer from the 1890s, the first type of device able to receive radio waves. When a radio signal was received by the coherer, the small metal pieces inside would cling together and allow a current to pass through. The current would trigger a bell or a pen attached to a paper strip which would make a record of the signal.
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The image below shows a coherer from the 1890s, the first type of device able to receive radio waves...
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