Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Ideal Heating
Here is a wonderful catalog from 1908 from American Radiator Company about their Ideal boilers and heaters. It will give you a glimpse of that long-gone time through pen-and-ink drawings and terrific descriptions of the products and what they can do for you. Ah, when central heating was new! How exciting it all must have been.
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Perfex Series 155 Magic Dial Thermostat
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