Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
The Cleveland Heater Company's Anode Patent (1949)
Here is a circa-1949 patent from The Cleveland Heater Company for a water heating device with a corrosion protective anode. Gerry Gill tells us that this company was at the forefront of anode protection. Joe Szakacs first shared this information with Gerry, and now he has shared it with us. Rest in peace, Joe. Thanks.
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Perfex Series 155 Magic Dial Thermostat
The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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