Morse sounder, 1835-1910

Made:
1835-1910 in Unknown place
maker:
Unknown

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Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Buy this image as a print 

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Morse sounder, unknown maker, 1835-1910. Used by the Post Office from 1874. SCM - Telecommunications.
© The Board of Trustees of the Science Museum
Science Museum Group Collection

Morse sounder, unknown maker, 1835-1910. Used by the Post Office from 1874. SCM - Telecommunications.
© The Board of Trustees of the Science Museum
Science Museum Group Collection

Morse sounder, unknown maker, 1835-1910. Used by the Post Office from 1874. SCM - Telecommunications.
© The Board of Trustees of the Science Museum
Science Museum Group Collection

Morse sounder, unknown maker, 1835-1910. Used by the Post Office from 1874

Morse sounder, unknown maker, 1835-1910. Used by the Post Office from 1874.

Morse code was the standard code for communicating by telegraph. The code uses a series of short and long connections in the electric current, usually called 'dots' and 'dashes'. These dots and dashes could then be decoded to reveal the message being transmitted. A telegraph sounder comprises a spring-loaded metal arm, pivoted near the middle. At one end is an electromagnet and at the other, an anvil. When a current passes, the electromagnet pulls the arm down, making a 'clunk'. When the current ceases the arm springs back against the anvil with another clunk. A dash is about three times as long as a dot, so the time interval between clunks indicates the dot or dash. The arrangement frees the operator to write down the message as it is received.

On display

Science Museum: Information Age Gallery: Cable

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Details

Category:
Telecommunications
Object Number:
1911-17
type:
telegraph
taxonomy:
credit:
Donated by H.M. Postmaster General
status:
Permanent collection

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