Arms Production | The Eli Whitney Museum and Workshop
Such marks have been interpreted to mean that Eli Whitney was using a waterpowered hollow mill, perhaps identifiable as either "the screw machine" mentioned by Philos in 1801 and the inventory in 1825, or as the "milling tools" associated with the "nitching machine" in the inventory. 14 The slots in the heads of the screws used in these muskets show that they were cut by a circular saw ...