John Henry Poynting, English physicist, early 20th century.

 
John Henry Poynting, English physicist, early 20th century.
4 0 c m
 
30cm
actual image size: 22cm x 32cm

Description

John Henry Poynting (1852-1914) demonstrated the existence of radiation presure and was President of the Physical Society from 1905-6. Poynting's 1884 paper 'On the Transfer of Energy in the Electromagnetic Field' contained his formula for connecting mechanical motion with electromagnetic forces. Poynting also showed that radiation has momentum, exerting a large presure under astronomical conditions.

Image Details

Image Ref.
 
10303072

© Science Museum / Science & Society Picture Library

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