A nickname for the shipyards in Salem that were gathered around the area of Norman Street and at the foot of Becket Street. There were so many that this district got the name of "Knocker's Hole" from the incessant pounding of the carpenter's mallets.
Some of these early shipbuilders were Daniel Bacon, father and son, Daniel Lambert and his successor, Samuel Swasey. The configuration of the harbor later changed when the railroads were built in this area and the low lands were filled in.
- Salem in the Eighteenth Century by Phillips, p. 276