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 10
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 186 through 203 and includes ratings for these manufacturers: Prudential Heating Co., Putnam Co. The, Quiet Automatic Burner Corp., Quiet May Div. of Penn Boiler and Burner Mfg. Corp., Raritan Radiator Co., Raypak Co. Inc., Red Wing Oil Burner Co., Reif-Rexoil, Inc., Republic Boiler Div., Ret-Rac Corp., Rheem Mfg. Co., Richardson & Boynton Co., Richardson & Morgan, Richmond Plumbing Fixtures Div., Richmond Radiator Co., Roberts-Gordon Appliance Corp., Robot Auto-Heat Corp., Rutledge Boiler Co., Inc., Rutledge Water Tube Boiler Co. R.W., Saunders Mfg. Corp. Schwab & Sons Co. R.J., Schwitzer-Cummins Co., and Scott-Newcomb Div.
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