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.
Webster Systems of Steam Heating
Here's the whole Warren Webster line from 1943, along with some very clear explanations of how their heating system worked. After the catalog material, you will find the patent for the company's boiler return trap. Thanks to Gerry Gill for finding and sharing that one.
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