Perfex Series 155 Magic Dial Thermostat
Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Attaining Maximum Efficiency & Economy from Low-Pressure Steam Heating Systems
Walter S. Finken sold KEK, a boiler cleaner. In this treatise, he explains how dirty water leads to wet steam and plenty of system problems. Thanks to Alex Marx for scanning this one.
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