= Ludwig A. Colding
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= Ludvig Colding
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<Ludwig A. Colding> was a Danish <engineer> who investigated the conversion between mechanical <work> and <heat> as part of the nineteenth-century development of <conservation of energy>. His work connects a practical measurement question—how much <heat> accompanies an expenditure of mechanical <work>—with a general statement about the persistence of <energy> through changes of form.
In an English letter dated November 1863 and published in 1864, he traced his claim to the conservation principle back to his 1843 work. The letter is a useful primary source for what <Ludwig A. Colding> himself understood his contribution to be, including the importance he attached to experimental evidence. The historical use of the word force in this discussion should be read in context rather than identified automatically with the modern <force>.<On the History of the Principle of the Conservation of Energy by Ludwig A. Colding>[Philosophical Magazine, fourth series, 27 (1864), pages 56–64]{ref}
\Image[https://upload.wikimedia.org/wikipedia/commons/6/6a/Ludvig_August_Colding_2.jpg]
{title=Portrait of <Ludwig A. Colding>}
{description=Georg Holtzweissig; Royal Library, Copenhagen, Denmark. Public domain (Commons PD-Denmark50, life+70 and pre-1931 U.S. publication tags). Source and usage information on the linked Wikimedia file page.}
{source=https://commons.wikimedia.org/wiki/File:Ludvig_August_Colding_2.jpg}
{width=250}
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