John Southern (engineer)

John Southern (c.1758–1815) was an English engineer, son of Thomas Southern of Derbyshire.^[1] In 1796 he and his employer James Watt co-invented the Indicator, an instrument for measuring and recording the pressure inside a steam engine cylinder through its stroke.^[2] This data was crucial for assessing an engine's efficiency. Southern became a partner of the firm of Boulton & Watt in 1810.^[1] The use of the instrument was kept as a trade secret for a generation, only becoming public in the 1830s.^[3]

References

^ ^a ^b H. W. Dickinson (31 October 2010). James Watt: Craftsman and Engineer. Cambridge University Press. pp. 131–. ISBN 978-1-108-01223-2.
^ Baird, Davis (2004). Thing knowledge: a philosophy of scientific instruments. University of California Press. p. 170. ISBN 978-0-520-23249-5.
^ M. Norton Wise (March 1997). The Values of Precision. Princeton University Press. p. 231. ISBN 0-691-01601-1.

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[Dickinson2010-1] H. W. Dickinson (31 October 2010). James Watt: Craftsman and Engineer. Cambridge University Press. pp. 131–. ISBN 978-1-108-01223-2.

[2] Baird, Davis (2004). Thing knowledge: a philosophy of scientific instruments. University of California Press. p. 170. ISBN 978-0-520-23249-5.

[3] M. Norton Wise (March 1997). The Values of Precision. Princeton University Press. p. 231. ISBN 0-691-01601-1.

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