An radiometer by Anonymous

An radiometer


Fine art poster

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  • Dimensions:
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    • x cm excluding border ( x in)

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We use a 280gsm fine art paper and premium branded inks to create the perfect reproduction.

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All products are created in our Surrey print factory in the UK, and we are the trusted printing partner of many high profile and respected art galleries and museums.

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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.

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Product details An radiometer

An radiometer


A radiometer with aluminium vanes. An instrument 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 explanation, warmer molecules striking the edge of the vanes obliquely with a higher force than the colder molecules.

ca. 1875

  • Image ref: RS-8489
  • The Royal Society

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