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It is hardly necessary to remind students of covered bridges that Timothy Palmer was born in 1751 in nearby Rowley ; ;

that he moved with his parents to West Boxford when he was sixteen years old ; ;

and was there apprenticed to a builder and architect, Moody Spofford.

It was indeed a remarkable feat that a man who had had no experience of bridge building should have applied the principle of the arch, which appears in his famous bridges at Portsmouth, Haverhill, and Philadelphia.