Loading coil
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A loading coil, or load coil, is an inductor that is inserted into an electronic circuit to increase its inductance. The term originated in the 19th century for inductors used to prevent signal distor
Pupin coils in PTT Museum in Belgrade (Serbia)
A typical mobile antenna with a center-placed loading coil (CLC)
An enormous antenna loading coil used in a powerful longwave radiotelegraph station in New Jersey in 1912
Toroidal telephone loading coil
A submarine communications cable is a cable laid on the seabed between land-based stations to carry telecommunication signals across stretches of ocean and sea.
Loading coil
…Heaviside condition. Previous telegraph lines were overland or shorter and hence had less delay, and the need for extra inductance was not as great. Submarine communications cables are particularly subject to the problem, but early 20th century installations using balanced pairs were often continuously loaded with iron wire or…
![Submarine cables are laid using special cable layer ships, such as the modern René Descartes [fr], operated by Orange Marine.](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d1/France_Telecom_Marine_Rene_Descartes_p1150247.jpg/500px-France_Telecom_Marine_Rene_Descartes_p1150247.jpg)
Submarine cables are laid using special cable layer ships, such as the modern René Descartes [fr], operated by Orange Marine.
A telegraph stamp of the British & Irish Magnetic Telegraph Co. Limited (c. 1862)
Operators in the submarine telegraph cable room at the GPO's Central Telegraph Office in London c. 1898
Landing of an Italy–USA cable (4,704 nautical miles long), on Rockaway Beach, Queens, New York, January 1925