Hooke's wheel barometer,1665

Numéro d’image : 11905418
Hooke's wheel barometer,1665
Hooke's wheel barometer. 17th-century illustration of the wheel barometer for measuring atmospheric pressure,invented by English natural philosopher Robert Hooke (1635-1703). The barometer was used to measure air pressure. Mercury filled a glass tube (centre) which is open at one end (marked 'F') and has a sealed bulb (top) at the other. The open end of the tube contains a ball which floats on the mercury. The float is attached to the pointer by a length of string. If air pressure rises the mercury is forced up into the bulb and the level of the mercury at the open end drops. As the float drops,the pointer moves. Artwork from 'Micrographia' (1665)
Licence : Droits gérés
Crédit: Science Photo Library
Taille de l’image : 2692 px × 3780 px
Model Release : Non requis
Property Release : Non requis
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