An otheoscope by Anonymous

An otheoscope


Fine art poster

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  • 280gsm thick fine art print paper
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Image information


Sizing information

Overall size x cm ( x in)
Artwork x cm ( x in)
Border (mount) cm top/bottom (in)
cm left/right (in)
Depth 3.8cm (1.5)
Frame face 2cm (0.79in)
Depth 2.3cm (0.9in)
Model is 5ft4in or 1.62m
Model is 5'4" (1.62m)

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We print everything to order so delivery times may vary but all unframed prints are despatched within 2-4 days via courier or recorded mail.

Delivery to the UK is £5 for an unframed print of any size, or free when you spend £60.

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Product details An otheoscope

An otheoscope


An 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 were put forward. It was not until 1879 that Osborne Reynolds suggested the correct explanation, warmer molecules striking the edge of the vanes obliquely with a higher force than the colder molecules.

ca. 1875

  • Image ref: RS-8488
  • The Royal Society

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