Jarecki Radiators (1890)
Here are ratings for the Erie radiator from Jarecki Mfg Co Ltd. They were based in Erie, PA and their radiators appeared in issues of Domestic Engineering in the 1890s.
Vapor Heating: The Richardson System
The Richardson System of vapor heating was popular in the 1910s and 1920s. It's very simple, and you must run it at very low pressure (less than 1 psig) on a vaporstat. This document in from The Heating and Ventilating Magazine.
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