O-E Vapor System Manual
This manual was created by O-E Specialty Manufacturing Co. and outlines how to install the "O-E" Perfect System, which is a Vapor Vacuum heating system.
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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