Hair hygrometer by Bate, 1830-1840.
UNITED KINGDOM - APRIL 20: In 1783, Horace Benedict de Saussure (1740-1799), a Swiss physicist and geologist, made the first hair hygrometer, using a human hair to measure humidity. This type of mechanical hygrometer makes use of the principle that organic substances expand and contract according to changes in relative humidity. The device was calibrated by exposing it to extremes of total saturation and dehydration, thereby establishing the hair's length at 0 and 100 % humidity respectively. (Photo by SSPL/Getty Images)
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Editorial #:
90763831
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SSPL
Date created:
April 20, 2004
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SSPL
Object name:
10450115
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