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・ John Sponlee
・ John Spooner
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・ John Spoor Broome Library
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・ John Spotton
・ John Sprague
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John Southern (engineer)
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・ John Souttar
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John Southern (engineer) : ウィキペディア英語版
John Southern (engineer)

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




抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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