Image: Ambrose pilot cable cross section
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Description: A 1921 depiction of the layers of the Ambrose Channel pilot cable.
Title: Ambrose pilot cable cross section
Credit: Original publication: Proceedings of the Institute of Radio Engineers Immediate source: https://books.google.com/books?id=REISAAAAIAAJ&pg=PA280#v=onepage&q&f=false
Author: A. Crossley (Life time: Not needed for pre-1923 publication)
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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