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Branly coherer

Branly coherer, an electro-magnetic wave detector comprising a glass tube of iron filings with electrode caps fixed by ebonite stands to a brown varnished rectangular wooden base, used by Sir Oliver Lodge, maker unknown, England, 1894

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Advanced search Search terms must be longer than two characters. Use a * as a wildcard to widen your search (for example, bagpipe* will find bagpipe, bagpipes and bagpiper).