A patent for a lathe - but also for treadle-drive stand that Edward Chaplin claimed could be adapted to drive other makes as well. Like so many other US patents for lathes intended for use by watcmakers and jewelers, it is though that the machine might never have been marketed. If it was sold, it must have been so few in number than none have survived. One unusual aspect of the treadle drive was a spring - appearing from the drawing to be of a considerable strength - that was intended to "equalize the rotation of the [fly]wheel (B) and assist the crank (E) in passing its centres" Presumably this means that the spring was there to pull the mechanism into a position so that pressing the foot plate would always start the drive without the operator having to position it by turning the flywheel.