Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Beacon Boiler Reference Book, Boilers Made Prior to 1959, Part 12
This is an excerpt of the Beacon Boiler Reference Book, Sixth Edition and includes ratings for boilers made prior to 1959. This section contains pages 213 through 246 and includes ratings for these manufacturers: Terre Haute Boiler Works Co., Texsteam Corp., Thatcher Furnace Co., Thompson Heater Co., Timken Silent Automatic Div., Titusville Iron Works Co. The, Toridheet Div. Cleveland Steel Products Corp., Triad Sales Corp., U.S. Radiator Corp., Union Stove Works, United Welding & Boiler Works, Universal Smokeless Boiler Co., and Utica Heater.
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