Uh Oh, I may be changing my vote here. I said capillary tube and now Ernie has me second guessing. The bummer is up till a year ago we had one in the pantry which we actually gave to a friend who wanted it as an antique. I remember the cam as Ernie describes but can't remember if it was bi-metallic or a capillary action.The last time I opened up one of these I found a bi-metallic strip that would open when the temperature was reached, and an excentric cam on the dial that set the temperature.
Zero electronics.
by Duane Benson
by Jake Hertz
by Aaron Carman
by Aaron Carman