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...
Dunham General Products Bulletin of Low-Pressure Steam Heating Appliances
This brochure outlines Dunham's product offering in 1946. It outlines how the Dunham Differential Vacuum Heating System worked. It also highlights products including Dunham differential control equipment, float and thermostatic traps, bucket traps, return traps, vacuum pumps, condensation pumps, unit heaters, convectors, fittings, pressure reducing valves, and air eliminators. There is a very good engineering section near the end of the booklet.
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