An otheoscope by Anonymous

An otheoscope


Fine art poster

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Free delivery when you spend over £75 (UK, EU & US)

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Sizing information

Overall size (inc frame) x cm ( x in)
Depth cm (in)
Artwork x cm ( x in)
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cm left/right (in)
The paper size of our wall art shipped from the US is sized to the nearest inch.
Model is 5ft4in or 1.62m
Model is 5'4" (1.62m)

Our prints

We use a 200gsm fine art paper and premium branded inks to create the perfect reproduction.

Our expertise and use of high-quality materials means that our print colours are independently verified to last between 100 and 200 years.

Read more about our fine art prints.

Manufactured in the UK, the US and the EU

All products are created to order in our print factories around the globe, and we are the trusted printing partner of many high profile and respected art galleries and museums.

We are proud to have produced over 1 million prints for hundreds of thousands of customers.

Delivery & returns

We print everything to order so delivery times may vary but all unframed prints are despatched within 1–3 days.

Delivery to the UK, EU & US is free when you spend £75. Otherwise, delivery to the UK costs £5 for an unframed print of any size.

We will happily replace your order if everything isn’t 100% perfect.

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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