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.
Table of Estimated Radiation
Written by Harry B. Perrigo in 1913, these four pages of simplified sizing information for heating systems must have been in the pockets of many a Dead Man over the years. Thanks to Gus Stants for sharing it with us.
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