Old wiring devices

[holmesuser01]

Originally Posted by maxhifi

In the VERY early days of electicitry, plugs were not yet standardized, and both types of plugs were used. The T slot receptacles, and the first one in this thread (which is another design of the same intent), were meant to accomodate both types of plug.

I have an old B&H movie projector with the uncommon style of plug.

I also have several B&H projectors. I know what you mean.

I recently saw a house for sale that had several Edison screw plugs in the walls at the floor. They were disconnected, but still there. If the sale happens, I'll pull them and post pictures of them.