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.
The Way It Was: Home Heating in 1916
Here is an old brochure about home heating in 1916. Thanks to Thomas M. Long, P.E. for scanning and sharing this document. He writes, "I don't remember where I got this, because I've had it in a file for a number of years. The reason I kept it is because we lived in a duplex about 30 years ago that had one of these gravity furnaces, although it had been converted to burn fuel oil. This was the 'central' heating system and included a square cast-iron grate in the living room floor. Somehow the warm air worked its way up the stairs and managed to keep at least part of the house reasonably warm."
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