An otheoscope Size:L: 80 x 60cm Landscape with lake and steam

Landscape with lake and steam clouds in the middle distance

Lord Frederick Cavendish had been appointed to the vacancy

View of London from One-Tree Hill in Greenwich Park

View of Chartwell House in Kent

much to the amusement of the men near by

An otheoscope Size:L: 80 x 60cm Landscape with lake and steamAn otheoscope with fixed vanes of oxidised copper and coloured disc above it. An instrument designed for measuring the mechanical effect of radiant energy, a modification of the radiometer. 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