Here is some very good literature on the Milwaukee Valve Company's vapor heating product offering from 1935, including the MILVACO Air Line Valve, the Type "M" Boiler Return Trap, the Type "V" Thermostatic Trap, MILVACO Quick Vents, MILVACO Automatic Air Valves, and the MILVACO Air Eliminator or Float Vent. Thanks to Patrick Linhardt for scanning and sharing.
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.
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.
Here is the original Installation and Operating Instructions and Parts List for The H.B. Smith Company's Oil Fired Cast Iron Hot Water Boilers (No. OHB-13W). This is esti...