Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Hoffman Heating Equipment Catalog (1929)
This catalog for the Hoffman Specialty Company from 1929 showcases their heating equipment, including Hoffman valves, Hoffman controlled heat, Hoffman-Economy pumps, and Hoffman Moto-Heaters. It is a glimpse of what Hoffman Heating had to offer at the start of the Great Depression. There are products in this catalog that we did not know they made. Great descriptions all around!
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Perfex Series 155 Magic Dial Thermostat
The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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