Sample of loading coil for Dover - Cap Grisnez submarine telephone cable, 1910

Made:
1910 in Woolwich
maker:
Siemens Brothers and Company Limited, Siemens Brothers & Company
Sample of Pupin loading coil for Dover - Cap Grisnez submarine Sample of Pupin loading coil for Dover - Cap Grisnez submarine Sample of Pupin loading coil for Dover - Cap Grisnez submarine Sample of Pupin loading coil for Dover - Cap Grisnez submarine

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Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

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

License

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

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

License

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

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

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Sample of Pupin loading coil for Dover - Cap Grisnez submarine
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Sample of Pupin loading coil for Dover - Cap Grisnez submarine
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Sample of Pupin loading coil for Dover - Cap Grisnez submarine
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Sample of Pupin loading coil for Dover - Cap Grisnez submarine
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Sample of Pupin loading coil for Dover - Cap Grisnez submarine telephone cable, probably made by Siemens Brothers and Company Limited, Woolwich, 1910.

The Dover to Cap Grisnez telephone cable was the first cable between England and the Continent to use loading coils. These were used to 'load' the cable with additional inductance to balance the greater capacitance caused by the cable's immersion in seawater. By doing so they reduced the capability of the cables to store electric charges, a problem which had meant that earlier telephone cables struggled with satisfactory speech transmission.

Details

Category:
Telecommunications
Object Number:
1953-114
Materials:
copper (alloy) and gutta-percha
Measurements:
overall: 987 mm x 70 mm diameter, 1.5 kg
type:
coil
credit:
Donated by the Institution of Electrical Engineers

Parts

Sample of loading coil for Dover - Cap Grisnez submarine telephone cable, 1910

Sample of loading coil for Dover - Cap Grisnez submarine telephone cable, 1910

Measurements:
overall: 987 mm x 70 mm diameter, 1.5 kg
Materials:
copper (alloy) and gutta-percha
Object Number:
1953-114/1
type:
coil
case for sample of loading coil for Dover - Cap Grisnez submarine telephone cable, 1910

case for sample of loading coil for Dover - Cap Grisnez submarine telephone cable, 1910

Presentation case for sample of Pupin loading coil for Dover - Cap Grisnez submarine telephone cable, unknown maker, England, United Kingdom 1910

Materials:
wood (unidentified) and metal (unknown)
Object Number:
1953-114/2
type:
case