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Hair hygrometer

Hair hygrometer, circular dial above brass cylinder with human hair as hygroscopic element, to measure atmospheric humidity, in shaped mahogany case, by Haas and Hurter of London, c. 1790

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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).