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File:Maxwell's letters plate IV.jpg


English: Diagram of Maxwell's thermodynamic surface, with "isothermals and isopiestics drawn by help of the Sun." Reproduced in P. M. Harman (ed.), The Scientific Letters and Papers of James Clerk Maxwell, vol. 3, 1874-1879, (Cambridge, UK: Cambridge University Press, 2002), p. 232
Date 8 July 1875
Author James Clerk Maxwell (1831 – 1879)


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