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.
Mark C. Honeywell's Patent for the "Unique" Valve
This valve, patented in 1907, gave the people installing hot-water heat a way to compete with the people who were installing one-pipe steam. The Unique valve allowed gave them a way to connect a hot-water radiator with just one pipe. Special thanks to Gerry Gill for sharing this with us.
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