It is 250 years since America's Mason-Dixon Line was completed. Hailed as a groundbreaking technical achievement, it came to symbolise the border between the Civil War North and South, separating free Pennsylvania from slave-owning Maryland. But who were the two British men who created it?
"It was the equivalent of the moon landings today," according to Mason-Dixon Line expert David Thaler.
Baker's son Charles Mason and lapsed Quaker Jeremiah Dixon were established scientists when commissioned to settle a land dispute in the pre-revolutionary America of 1763.
For 80 years the Calvert family of Maryland and the Penns of Pennsylvania had been locked in a bloody dispute over the boundary between the two colonies they had been granted by the English Crown.
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