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.
Roman Hypocausts
This excerpt is from an 1845 book titled, Bernan's History and Art of Warming and Ventilating Rooms and Buildings. Walter Bernan was a Civil Engineer in London. What we have here is an extremely thorough look at how the Romans did radiant heating.
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