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Couriously little is known of the two who set7 up America’s most famous boundary. Charles Mason was assistant astronomer at England’s Greenwich Observatory. With Dixon, whose background is obscure, he had been sent abroad in 1761 to observe a transit of Venus. 7 The survey, of the Pennsylvania- • Maryland borders took four years After checking and correcting the peninsula lines,. Mason and Dixon took rfie westward trail in 1765 with a large party of assistant surveyors, axmen and guides. They covered some 230 miles of wild and beautiful country before hostile in- ' Indians forced them back.
But the job was already completed. The accuracy of their measurements has been proved by modem surveyors, who found a difference in latitude of only 2.3 seconds (180 feet) from the Mason-Dixon figure.
new survey of the three States’ boundaries was made in 1950. Most of the original stone markers were in place. Many had deteriorated, however', especially the original five-mile “crown stones” carved in England with Penn and Calvert arms on either side.
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