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.
Steam-Boiler Water Feeder Patent (1879)
William C. Wolfe's circa-1879 patent for a water feeder shows an invention that is remarkable simple and fully automatic. It's probably one of the earliest feeders to appear in the world of steam heating. The patent explains how it works.
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