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Original wheel or steel-disc coherer, 1902
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Original wheel or steel-disc coherer, 1902, result 1 of 1

Item Details
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Title
Original wheel or steel-disc coherer, 1902
Original wheel or steel-disc coherer (thin-film detector), 1902
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Work Type
Radio Communication
Date
1902
Location
England
Material
bakelite
brass (copper, zinc alloy)
wood (unidentified)
Measurements
overall: 80 mm x 100 mm x 95 mm, .18 kg
Description
Original wheel or steel-disc coherer (thin-film detector), made by E E Robinson, England, 1902. Made for Oliver Lodge and Alexander Muirhead
Original wheel or steel-disc coherer (thin-film detector), E E Robinson, England, 1902. Made for Oliver Lodge and Alexander Muirhead
Original wheel or steel-disc coherer (thin-film detector), made by E E Robinson, England, 1902.
By the time that the wheel, or thin-film detector, was developed in 1902, the term 'coherer' was being applied to all types of detector, whether or not they utlised materials which 'cohered' in the presence of Hertzian waves. Edward Robinson, Oliver Lodge's assistant, was principally responsible for devising this detector. The steel disc, with a sharp edge, rotates continuously and dips into a small pool of mercury covered with a thin film of oil. When Hertzian waves are detected the disc makes contact with the mercury and as the disc rotates a fresh surface is continuously being presented to the mercury. It is therefore described as being self-cohering - that is, not requiring a series of mechanical jolts to reset it. This is one of Robinson's bench-top prototypes.
Repository
Science Museum, Information Age Gallery: Cable
Donated by E. E. and T. H. Robinson
Accession Number
Subject
coherer
ID Number
co34845
Source
Image and original data from Science Museum Group
Rights
The source metadata displayed in the Description field is released under a Creative Commons Attribution 4.0 license.
All other source metadata is released under Creative Commons Zero.
File Properties
File Name
large_1942_0038__0001_.jpg
SSID
26288790

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