Arithmetick by inspection. Or, So easy a way, to learn and use that art, that even those who can neither write nor read, have been thereby taught all the general parts of it. : (They being reduced to numeration) as also to summ accounts, and work the rule of three. Likewise, skilful artists may save much time and pains in great calculations, and in extracting the square & cube roots, by help of an instrument invented by C.C. Knight, anno 1667, and then made for him by Robert Jole. Whose humble request hath obtaind his leave to print this direction for the use of it, and to sell both at his shop the Sign of the Globe against the Feathers Tavern near Fleet-Bridge.