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.
Stephen J. Gold's Boiler Patent
Stephen Gold was the inventor of the first radiator, the "mattress" radiator. Here is is patent for his boiler, which appeared nine years later. Much thanks to Gerry Gill for sharing this wonderful document with us.
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