. Thermostatic control of electric heating appliances . < 1 ^ n o-vWW/—. CO *<—t- 6 6 £0. also minimize the arcing at these points thus be-ing of a triple advantage over that shown In Fig. 4. PARALLEL OVAR BAUD Another methodin whloh the differences In the coefficients ofexpansions could be employed to affect the operationof a magnetic relay Is shown In the drawing Is the b^ee plate of the flat iron, 6 Is a stripof some metal preferably Invar whose coefficient ofexpansion is much less than that of the metallic baseplate. The strip B is rivited to the base as shown,and w
. Thermostatic control of electric heating appliances . < 1 ^ n o-vWW/—. CO *<—t- 6 6 £0. also minimize the arcing at these points thus be-ing of a triple advantage over that shown In Fig. 4. PARALLEL OVAR BAUD Another methodin whloh the differences In the coefficients ofexpansions could be employed to affect the operationof a magnetic relay Is shown In the drawing Is the b^ee plate of the flat iron, 6 Is a stripof some metal preferably Invar whose coefficient ofexpansion is much less than that of the metallic baseplate. The strip B is rivited to the base as shown,and when the iron is heated, since the base will ex-pand more rapidly than the strip B, this strip willtend to approach the surface of the base. By mount-ing a pin C on this strip the motion of the samecaused by this action can be made to control the cir-cuit of an auxiliary heating element, by proper ad-justment. The device as shown in Fig. 7 would ofcourse not be a very sensitive one but could be madeso by having the pin C act upon a multiplying leveras shown in Fig. 7A.
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Keywords: ., bookcentury1900, bookdecade1910, bookidthermostatic, bookyear1917
