Radiometers and otheoscopes Finish:Single Views of the exterior of

Views of the exterior of the chapel (top) and its ambulatory and stairs

'Temple Bar from the Strand'

Scene during the thanksgiving service for the recovery from illness of King George III

Found in the collection of the Toledo Museum of Art

Radiometers and otheoscopes Finish:Single Views of the exterior ofRadiometers 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