This document contains a series of interesting articles by Mills and LaTart of Revere Copper and Brass about radiant heat with copper tubing. It is not dated, but is most likely from the late-1940s. Thanks to Jim Walls for finding and scanning this one.
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...