John Southern (engineer)

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File:Houghton EC75.So883.785t - title.jpg
A Treatise upon Aerostatic Machines, 1785, by John Southern

John Southern (c.1758–1815) was an English engineer, son of Thomas Southern of Derbyshire.[1] He co-invented the indicator diagram with his employer, James Watt, in 1796.[2] Southern became a partner of the firm of Boulton & Watt in 1810.[1] The use of the diagram was kept as a trade secret for a generation, only becoming public in the 1830s.[3]

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