Diagrams, graphs of general equation of thermodynamics by WJMR [William John Macquorn Rankine] Figures 1-2 showing two graphs of the general equation of thermodynamics, figure 2 illustrating its application to fluids changing from liquids to gas. Inscribed recto and verso with publication and plate details. A graphite inscription up the left side reads 'Reduce one-third'. Signed in ink bottom right 'WJMR.' An ink inscription bottom left reads 'Decr. 1858.' The manuscript for this paper is wanting. Subject: Engineering / Physics Published in Philosophical Transactions as part of paper titled 'On the thermo-dynamic theory of steam-engines with dry saturated steam, and its application to practice' by William John Macquorn Rankine. Received by the Royal Society on 27 December 1858. Read 27 January 1859. December 1858