Salt works once were a common sight along Cape Cod shores. Today, a replica of a salt works sits on the grounds of the Aptucxet Trading Post in Bourne. Salt was in constant demand for colonists who came to the new world from England in the 1600s. It was mainly used to preserve food, and the colonists got much of their supply of salt from England. But they wanted to figure out how to make it themselves. Initially, they tried filling cast-iron kettles with water. “They’d build a fire under it, and