Axil Axil <[email protected]> wrote: In a torus, the internal heater would be difficult to impossible to position > correctly, i.e. in the center. >
I envision a ring heater, on the inside, around the central hole. The wires have to pass through the walls of the cell. I have seen flexible nichrome heater wire, that could be wrapped or shaped as needed. Pretty sure it was nichrome. - Jed

