Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Eggleston Relief Device for Hot Water System Patent
This device, patented in 1905, is similar to the Honeywell Heat Generator. Thanks to Gerry Gill for finding and sharing it. Gerry points out that Lewis Eeggleston went on to become a heating engineer/inventor with numerous patents for both the American Radiator Company and the Detroit Lubricator Company.
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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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