“A mechanical manufacture being commonly occupied with one substance, which it conducts through metamorphoses in regular succession^ may be made nearly automatic; whereas a chemical manufacture depends on the play of delicate affinities between two or more substances, which it has to subject to heat and mixture under circumstances somewhat uncertain, and must therefore remain, to a corresponding extent, a manual operation.”

—  Andrew Ure

Source: The Philosophy of Manufactures, 1835, p. 2

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Andrew Ure 14
Scottish doctor and chemist 1778–1857

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