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.
Indirect Radiation
This excerpt is from The Ideal Fitter (1922). You'll find indirect radiators (both steam and hot water) within basement ductwork. Often, there is a connection to outside air, and warm-air discharge to floor- or wall grates in the rooms.
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