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.
Noiseless Steam Heating System
Here's a playful article from The Craftsman magazine (May 1914), published during a time when vapor/vacuum heating was just coming into its own. One of the huge advantages this system had over one-pipe steam was its quietness.
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