Perfex Series 155 Magic Dial Thermostat
Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
O-E Perfect System
The O-E Perfect System was a Turn-of-the-Century vapor heating system, simply described and pictured in this document. Thanks to Alex Marx for scanning this one for us, and Gerry Gill for finding the patents.
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