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.
National Radiator Company's No. 2 Oil-Fired Boiler
Here is an interesting presentation of extended heating surface in a boiler, featuring National Radiator Company's No. 2 Oil-Fired Boiler. Size matters. This is from 1941.
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