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.
Steam Traps (1905)
Thanks to historian, Bernard Nagengast, for sharing this circa-1905 article from American Electrician magazine, which does a great job of explaining the steam traps, and boiler-return traps of that era.
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