The pit saw leaves marks on wood that look like this ///////////.
The pit saw is a two-man powered saw used in America before 1680 to cut logs into boards.
Items made after 1846 are made using this new screw.
The stylistic techniques used to date formal furniture such as Chippendale and Hepplewhite simply does not work for American country and primitive furniture.During the Industrial Revolution, the method of making nails, screws, hinges, latches, and of milling lumber changed often. The style of nails changed a dozen times, the hinge changed four times, the screw changed three times, and so did latches and pulls.The methods of working wood also changed during this time.The slot still had to be cut by hand with a hacksaw.Country furniture made with these screws can easily be dated to the ten-year period 1846-1856.After 1700, its major use was as a large jigsaw to shape knees, ribbing, and planking for ships.