English: A Marconi Crystal Receiver, Mark III. It was known as a 'Cat's Whisker receiver', and used on the ground to receive signals from aeroplanes during the First World War. This one is displayed at Porthcurno Telegraph Museum, Cornwall (January 2019).
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A Marconi Crystal Receiver, Mark III, known as a 'Cat's Whisker receiver', and used on the ground to receive signals from aeroplanes. Displayed at Porthcurno Telegraph Museum.
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