The Improved Webster Type "R" System of Steam Heating is a service bulletin from Warren Webster and Company (The Pioneers of Vacuum Steam Heating), established in 1888.
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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