Radiometers and otheoscopes Finish:Single Intended as a subscription ticket

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

View of Hanover Lodge

to take her away

He is dressed in grey breeches

Radiometers and otheoscopes Finish:Single Intended as a subscription ticketRadiometers 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