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.
The Big Fault in One-Pipe Heating
In 1935, John W. Schulz, writing in Fuel Oil Journal, makes a brilliant case for looking more closely at steam systems designed with coal in mind when the time comes to switch to an automatic fuel.
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