Between 1775 and 1778 John constructed a dividing engine, on the lines of that recently designed by Jesse Ramsden, by which he was able to increase both his accuracy and his rate of work.
Sa pagitan ng 1775 at 1778 John na itinayo ng isang naghahati engine, sa mga linya ng mga kamakailan-lamang na dinisenyo ni Jesse Ramsden, kung saan siya ay upang dagdagan ang parehong kanyang kawastuhan at ng kanyang rate ng trabaho.