Looking at the individual items, clockwise from top left:
4-legged thing with wire - not sure.
Top-centre, (caged item) - possible solenoid coil winding, used in conjunction with;
Top-right - spring contact.
Right-centre - Single Pole Single Throw switch.
Lower-right - Single Pole Double Throw switch.
Centre - Potentiometer.
Lower left - 4 position switch.
What it was used for? I have no idea.
Yes, it is still sitting under my workbench if anybody wants it. I was looking for a voltage reference when I asked the .OP to show us what was under the plate - my mind was going in the same direction as yours, Ron.It looks like an old milli volt pot that pre dates some of the early L&N models. I just don't see a galvanometer on it. The center looks to be a carbon pot of sorts with a wiper. Whatever it is, it is interesting.
Gopher, wasn't it you that came across an old L&N version?
Test it out on friends and family - let us know how it works.well we found the exact machine!!!!! it is a 1937 electro shock machine https://www.etsy.com/listing/528061...tage&ga_view_type=gallery&ga_search_query=art therapy&ref=sr_gallery_1
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