john elder

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born March 8, 1824, Glasgow, Scot. died Sept. 17, 1869, London, Eng. Scottish marine engineer. In 1854 he developed the marine compound steam engine (using both high-and low-pressure steam), which enabled seagoing vessels to save 30-40% of the coal they had been burning and helped make practical long voyages on which refueling was impossible
john elder

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    John eld·er

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    cän eldır

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    /ˈʤän ˈeldər/ /ˈʤɑːn ˈɛldɜr/