RS-9700 seriesthermalprotectorconsists ofdishshapehighsensitivebimetallic elemeng, movable contact-head, static contact-piece, soleplate, outer case, ghermal resistant lead and so on.
Was it really the Lord Protector's head that was rammed on a pike in Whitehall, to discourage regicides, only to be blown down in a gale and swiped by a soldier?