Posted by Hacksaw on 25/01/2018 21:39:37:
hey , they really are split pins ! One has screw terminals ,fair enough ..
the other holds the wire ends by tightening the cap !
That bottom plug brought back memories!
I think they were made by CLIX and when I worked in the early 60s as a radio and TV service engineer we had a row of 2 pin socket along the front of the bench into which we plugged the thing we were repairing. We did not have luxuries such as isolation transformers but a neon screwdriver was always in hand so ensuring the chassis was on the neutral side was second nature.
The workshop manager was a stickler for tidiness and insisted that at the end of the day all the plugs were accounted for by being put into the bench sockets so we could end up with a row of plugs but with nothing connected. On more than one occasion a plug would be deliberately left on the bench next to an empty socket,,,, On spotting this at the end of the the manager would put the plug in, only to be greeted by a flash and a bang!
Fuse wire, or more likely multicore solder had been installed between the split pin, nobody ever admitted it though.
Ian P