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.
H.B. Smith Boiler and Radiator Catalog (1929)
Here's a good source for the ratings of old H.B. Smith radiators. It starts on page 56. Here's the LINK.
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