Radiometers and otheoscopes Finish:Single to take her away

to take her away

Martin Singleton

Intended as a subscription ticket for an engraving of Hogarth's ill-fated painting Sigismunda

on the corner of Fleet Street and Whitefriars Street

seated on a black ram with the face of Bartolomo Pergami

Radiometers and otheoscopes Finish:Single to take her awayRadiometers 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