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.
Noiseless Steam Heating System
Here's a playful article from The Craftsman magazine (May 1914), published during a time when vapor/vacuum heating was just coming into its own. One of the huge advantages this system had over one-pipe steam was its quietness.
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