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.
American Society Of Heating And Ventilating Engineers Guide, Volume 13 (1935)
The American Society Of Heating And Ventilating Engineers Guide (Volume 13) from 1935 contains reference data on the design and specification of heating and ventilating systems. To access this book online, click here.
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