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Vintage illustration diagram showing Green`s Economizer of 216 tubes arranged in 3 groups of 72 tubes each. It was patented by Edward Green in 1845, and since then has been known as Green`s economiser. It consisted of an array of vertical cast iron tubes connected to a tank of water above and below, between which the boiler`s exhaust gases passed.
1900s reference to engineering / energy / power.