Description
Landscape with lake and steam clouds in the middle distance
two of the new iron-clad men of war ships
the print is embossed 'Charles Spencer
Citroën 2CVs at an auto-cross
Lord Frederick Cavendish had been appointed to the vacancy
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
Exchange/Return Notes
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