A History of the Radiator
Brian Roberts & Paul Yunnie compiled this document that contains beautiful vintage advertisements and illustrations of radiators from the mid to late 1800s and early 1900...
Vapor Heating: The Imico System
The Imico System was a rare vapor heating system. "There is no air valve at the radiators in this system and no trap on the return end of the individual radiator. Vacuum is maintained in this system by the Dewey tri-duty air and vacuum trap, which is a combination of the Dewey quick vent air valve and the Dewey vacuum valve." Here is some information about it from The Heating and Ventilating Magazine.
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