# Did old Crookes Radiometers ever have a pair of terminals?

This is a question about old physics lab equipment.

This and this question led to the question in SciFi SE Crookes Radiometer at the end of a telescope in old movie scene, something about a comet? which led to the image below.

Of course one does not use wires to couple a radiometer to a telescope.

However, my question is about the (now old, possibly then as well) Crookes Radiometer shown in the image from 1965. There are two terminals in the wooden base of the radiometer.

Question: Did old Crookes Radiometers ever have a pair of terminals? I can imagine a heater used to evaporate trace amounts of some material to adjust the pressure for teaching/demonstration purposes, or even some kind of getter pump to reduce the pressure (as some electron tubes had), but I thought I'd ask here to see if someone familliar with older lab equipment might know.

below: Screen shot from this video of Episode 3 (1965) of The Time Tunnel The end of the World after roughly 36:15.

• I'm looking for a tag like equipment or apparatus or something like identify-this-object but so far no luck. – uhoh Mar 13 at 10:55
• I originally asked this question in Physics SE ten months ago but there was no activity. Today I've deleted it there and posted it here instead, since migration is no longer possible. – uhoh Mar 13 at 10:56
• Crookes' Crookes Radiometer had terminals, but not like your image. – Keith McClary Mar 25 at 3:12
• @KeithMcClary I'd never seen that before, thank you! Isn't it totally amazing coincidence that Crookes' Radiometer was a Crookes Radiometer!? ;-) – uhoh Mar 25 at 5:08