Re: Coax cable - When did it begin?
The Wireless Set No.17 designed just prior to WWII (1938 I vaguely recall) has a coax socket for its aerial connection. I have the aerial designed for the set, and it has a coax feeder.
I also have a vague recollection that undersea telegraph cables - i.e. from the Victorian era - also had a concentric construction, like coax. Clearly they weren't "coax" as such, since the outer was designed as armouring against rupture. But I think the cable would have functioned as a coaxial transmission line all the same.
Richard
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