Re: Faraday chamber.
I should have mentioned that the very fine copper mesh illustrated in my previous post has bewilderingly fine silk insulation on the wires, they're only connected together at the metal earthing bracket at the top of the picture- as David says, this is fundamental to the effective operation of the screen.
Quite some time ago, there was a picture on the forum of a copper bar Faraday screen between primary and secondary of the aerial coupling in a slightly intimidating '30s 500kW MF transmitter,
Colin
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