Radiometers and otheoscopes Finish:Single View of Middle and Inner

View of Middle and Inner Temple

seated on a black ram with the face of Bartolomo Pergami

23rd September 1962

Martin Singleton

Radiometers and otheoscopes Finish:Single View of Middle and InnerRadiometers and otheoscopes, instruments designed for measuring the mechanical effect of radiant energy. Mounted in a partial vacuum, the central rotor spins when the vanes are exposed to light. Chemist William Crookes (1832 1919) initially believed the vanes with black surfaces were pushed around by pressure from light radiation. This was incorrect and other theories were put forward. It was not until 1879 that Osborne Reynolds suggested the correct