The whole of this part of the subject depends on the consideration of the Intrinsic Energy of a system of bodies, as depending on the temperature and physical state, as well as the form, motion, and relative position of these bodies. Of this energy, however, only a part is available for the purpose of producing mechanical work, and though the energy itself is indestructible, the available part is liable to diminution by the action of certain natural processes, such as conduction and radiation of heat, friction, and viscosity. These processes, by which energy is rendered unavailable as a source of work, are classed together under the name of the Dissipation of Energy.
Theory of Heat http://books.google.com/books?id=DqAAAAAAMAAJ "Preface" (1871)
“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.”
Source: The Philosophy of Manufactures, 1835, p. 2
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Andrew Ure 14
Scottish doctor and chemist 1778–1857Related quotes
Theory of Heat http://books.google.com/books?id=DqAAAAAAMAAJ "Preface" (1871)
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