Cyclopedia of mechanical engineering; a general reference work. Editor-in-chief Howard Monroe Raymond. Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing (1908)
American School (Chicago, Ill.), Raymond, Howard Monroe · Chicago American Technical Society · leaf 304
e Down Draft sy.stem is the more mod-ern and generally the best. The Blast is fiuiiished to the fires of a l)Iacksmith shop by iijowersof various kinds. For many years the ordinary bellows was used.This has been superseded by the fan blower which is now almostuniversally used, even for hand jiower.… … tie. I. of the shell and escapes through the tangential opening. Thepressure of the blast u.sed for an open blacksmith fire varies fromabout 2 to 7 ounces per square inch. Tlie lower ])re.ssure is usedfor a light fire and light work. The higher pressure is suitablefor heavy classes of work.…
Mechanical engineering
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