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• 22:13, 3 August 2016 Dnevil talk contribs uploaded File:Popsci feb1941 fig3.jpg (To get up steam quickly, forced draft is produced by sucking air from the stack with the aid of a small electrically-driven compressor. The coal fire in fire box is boosted by directing a gas flame against the hot embers. https://books.google.com/book...)