The Peerless Heater Company Catalog
We estimate that this cast-iron boiler catalog from The Peerless Heater Company in Boyertown, PA is from the 1980s or 1990s.
G.M. Davis Air Valve Patent (1889)
On June 11, 1889, the G.M. Davis Regulator Company of Chicago, Illinois patented the Victor No. 2, an automatic air vent for steam radiators. It worked by the expansion of a composition element. It would be years before the industry produced a truly reliable air vent that didn't squirt water all over the curtains but this was a nice start. Nowadays, we take air vents for granted but they did not arrive easily.
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