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.
Gravity Heating System Design
Thanks to Mike Thies for finding and sharing this chapter. He writes, "This is from the book, Heating Design and Practice, 1951, by Robert Henderson Emerick. While not really about piping practice, it's the best I've found at explaining the science behind gravity systems."
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