The second one appears to be a “cutaway” teaching model to show how the displacer and linkage run inside a Stirling engine.
I expect the 2 alloy parts move in a sequence where one lags the other?

Dave

I think Philips donated the generators to schools; I'd love to get my hands on one one day. That is obviously a visual tool to demonstrate the operation.

My grandfather made stirling engines intending to use them to power irrigation pumps in africa, but it never came to anything.

I think this item is a wire terminal to plug/socket adaptor from a school or university science lab. Same hook-up function as is done today with banana plugs and sockets.

Looks multi-purpose:

• Male plug into the centre hole, or
• Female socket on to the outer taper.

The fluted item is probably an adaptor to take a different type of male plug.

Maker someone like Becker, George, or Griffen and George. Bakelite and brass suggest pre-WW2, possibly decades earlier. If someone has access to old catalogues, listed as Pattern 5001.

I have a press-to-make tapper switch in similar brass and mahogany style somewhere.

Dave

Most likely a red herring but I did find this:

**LINK**

Visible on the small plate is PATT 5001. I wonder if it is a regulation, manufacturer or similar?

EDIT I've since read it most likely means pattern, as in the design something is made too, especially with regards to MoD equipment.

They are mentioned in passing here, specifically spark gap condensors, which could make sense..

https://worldradiohistory.com/hd2/IDX-AUSTRALIA/IDX/Amateur-Radio/70s/Amateur-Radio-AU-1970268.pdf

Edited By Jon Lawes on 29/03/2022 05:13:48

Edited By Jon Lawes on 29/03/2022 05:16:04