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.
Piping Design for Oil Firing
In this 1933 Fuel Oil Journal article, O.O. Oaks, Chief Engineer for the American Radiator Company, explains the effect automatic firing has on a steam system that was piped for coal-fired operation. Today, it would apply to both oil- and gas-fired boilers on older steam systems.
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