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.
Humidity in House Heating
Humidity in House Heating: The Cause And Control of Air Dryness In House Heating is a circa-1929 booklet from the Dominion Fuel Board and the Natural Resources Intelligence Service Department of the Interior in Canada.
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