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ELDER, John (1824-1869) Marine Engineer & Ship Builder.

His major contribution to engineering was his thorough understanding of the principles of thermodynamics, and through that development of the first practical compound or combined high and low pressure steam engines, previous attempts at  which had all proved to be failures. It resulted in fuel savings of 30 to 40% and opened up the world’s oceans to ships powered by steam. The days of  commercial sailing vessels were numbered from then on.

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