588,829. Temperature - responsive actuating - elements. SATCHWELL, L., WILSON, W. H., and CHINN, A. J. July 22, 1944, No. 14040. [Class 64 (ii)] [Also in Groups XI and XXXVII] In a thermal regulator (see Group XXXVII) in which variation of the proportion of " on " and " off " in times of an intermittent electrical switching cycle varies the energy input to a heating device, a bimetallic strip 3 forming a thermally responsive member is fixed to heating means (see Group XI) comprising a metal block composed of two parts I, 1<1> between which is clamped a resistance in the form of a cut or stamped metal leaf or leaves a, b, c.