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In page Elder Dempster Lines:

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John Dempster was born in 1837 in Penport, Thornhill, Dumfriesshire where his father, William Dempster, was builder to the Duke of Buccleuch. The Dempster family moved to Birkenhead in the 1840s and John joined W and H Laird as a clerk in 1851 when he was aged 14.[citation needed]