Paul,
These appear to be educational demonstration tubes. The tube on the
right of the image has a phosphor screen at the top, and what looks like
an electron gun assembly, mostly hidden at the bottom in the cardboard
holder. I wonder if the tube was meant to be used in a "Mass of the
Electron" demonstration setup.
The other two tubes have parallel plates with two side electrodes. I
can't make out any structures attached to the side electrode
connections. It's hard for me to imagine what sort of principle they
might have been trying to demonstrate.
I wonder if there is a gas fill in the tubes or a hard vacuum.
The corrosion on the side electrode connections indicated that they have
been around for a very long time.
Dave
On 2/11/2020 7:11 PM, Paul Andrews wrote:
> Anyone have any idea what these might be?
>
> IMG_4690.JPG
>
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