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.
An Outline of Ventilation and Warming (1899)
An Outline of Ventilation and Warming was written by WM. J. Baldwin in 1899. He was known as the pioneer writer in America on the subject of steam heating at the time. To access this book online, click here.
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