The Mouat Vapor System was one of the classics of vapor heating! Here is an excerpt from The Heating and Ventilating Magazine explaining how this system works. And you'll find the Mouat Vapor Heating Co. circa-1926 catalog here.
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...