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(41.) An operation in which rapidity is of essential importance is in bringing the produce of mines up to the surface. The shafts through which the produce is raised are sunk at a very great expense, and it is, of course, desirable to sink as few of them as possible. The matter to be extracted is therefore raised by steam-engines with considerable velocity; and without this many of our mines could not be worked with profit.
Excerpt: Charles Babbage, On the Economy of Machinery and Manufactures, London 1832