In 1811 , Josiah Green began making shoes , and in 1834 he built a factory .
Spencer 's first mill was built in 1740 on the Seven Mile River , the greatest source of waterpower in the town .
In 1811 , Josiah Green began making shoes , and in 1834 Spencer built a factory .
Spencer 's first mill was built in 1740 on the Seven Mile River , the greatest source of waterpower in the town .