De Saussure hair hygrometer, 1801-1830.

UNITED KINGDOM - JUNE 03: 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. (Photo by SSPL/Getty Images)
UNITED KINGDOM - JUNE 03: 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. (Photo by SSPL/Getty Images)
De Saussure hair hygrometer, 1801-1830.
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Crédito:
Science & Society Picture Library / Colaborador
Editorial #:
90732076
Coleção:
SSPL
Data da criação:
03 de junho de 1999
Data do upload:
Tipo de licença:
Rights-managed
Inf. sobre autorização:
Não tem autorização. Mais informações
Fonte:
SSPL
Nome do objeto:
10316560
Tamanho máx.:
3504 x 2669 px (29,67 x 22,60 cm) - 300 dpi - 3 MB