Darren (32VAC),
You've jogged my memory. [Linked Image]
The 2pin-T here was used as an Aerial and Earth connector, for Valve radio sets in the 1930's and 40's.
I rememeber my Great-Grandfather had a really elderly Valve set at his house way out in the sticks and also a huge Aerial system that went with it.
It also had it's own Earthing system too, that was kept right away from the Mains Earth.
The pin on the radial line (like our current earth pin) was the Earth of the Radio system, the other being the Aerial.
I remember my Great-Grandmother freaking out one day to get the Radio unplugged from the Aerial one day, with the sound of thunder overhead, we missed the end of the Cricket game between us and Aussie.
When the radio was connected back up(some minutes later) and turned on again the Radio New Zealand News was on and told us we had lost.
What a downer!
Having your house wrecked by lightning and satisfying a Cricket fan are two different things, I rate the second one to be more important. [Linked Image]

[This message has been edited by Trumpy (edited 01-05-2005).]