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De Saussure hair hygrometer, 1801-1830

IMAGE number
UIS5086314
Image title
De Saussure hair hygrometer, 1801-1830
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Location
Science Museum, London, UK
Medium
object
Image description

De Saussure hair hygrometer, 1801-1830. 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. Made by Harris. Shown in its case. ©SSPL/Science Museum

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SSPL/UIG / Bridgeman Images
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Largest available format 3504 × 2669 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3504 × 2669 px 297 × 226 mm 1.3 MB
Medium 1024 × 780 px 87 × 66 mm 986 KB

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