An early coherer, 1894. A coherer is an ear
3 0 c m
40cm
actual image size: 32cm x 22cm

An early coherer, 1894. A coherer is an ear

© Science Museum / Science & Society Picture Library

Description

An early coherer, 1894. A coherer is an early form of radio detector, usually consisting of a glas tube loosely filled with metal filings whose bulk electrical resistance decreases in the presence of radio waves. Sir Joseph Oliver Lodge (1851-1940) realised the potential of the coherer for wireles communication, and gave the first demonstration of a wireles transmision and reception at the Royal Institution in London in 1894.
 

Image Ref.

10322614
 

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