The principles of arithmetick: with helpfull observations, making the entrance easie, and the practice pleasant: teaching the five ordinary parts of arithmetick, the usuall way: the performance of multiplication and division, onely by addition and subraction: with new an notable abridgments: rules of practice, with extraordinarie helps: and therein, some excellent observations, for the easie casting up of interest. The doctrine of fractions, the foure rules of arithmetick: recreations extraordinary; or the easie performance of (seeming) impossibilities. By William Webster.
The sea-mans practice, contayning a fundamentall probleme in navigation, experimentally verified: namely, touching the compasse of the earth and sea, and the quantity of a degree in our English measures. Also, an exact method or forme of keeping a reckoning at sea, in an kinde or manner of sayling. With certaine tables and other rules usefull in navigation. As also in the plotting and surveying of places. The latitude of the principall places in England. The finding of currents at sea; and what allowance is to be given in respect of them. By Richard Norwood, reade of the mathematicks.
