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.
General Report on the Explosion of Steam Boilers
This 1836 report came from the Committee of the Franklin Institute of the State of Pennsylvania for the Promotion of the Mechanical Arts. They were writing at a time when boilers were sailing through the air just about every day. Imagine that.
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