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 9
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 166 through 185 and includes ratings for these manufacturers: Pacific Steel Boiler Div., Page Co., Wm. H., Page Water Tube Boiler Co., Paragon Oil Burner Corp., Pate Co., Inc., Peck-Williamson, Peerless Heater Co., The Penn Boiler & Burner Mfg. Corp., Pennsylvania Furnace & Iron Co., Perco Heater Corp., Persiro Mfg. Corp., Persson & Kellison, Petro, Phoenix Steel Boiler Works, Pierce Butler Mfg. Corp., Porcupine Boiler Co., The Portmar Boiler Co., Inc., Preferred Utilities Corp., Prizer Painter Stove & Heater Co., and Prox Co. Inc. Frank.
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