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.