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.
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- Donated by the Institution of Electrical Engineers
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