A system of practical mathematics [electronic resource] : Containing vulgar and decimal fractions; the extraction of the square and cube roots; multiplication of feet, inches, and parts; the mensuration of superficies and solids, and all sorts of artificers work. Plain geometry and trigonometry, with their application, with their application in measuring the altitude of objects and distance of places; surverying; spherical geometry and trigonometry; astronomy, and dialling. With a plain account of the Gregorian or new style, settled by act of Parliament; the method of finding the epact, moon's age, tides, &c. With necessary tables: particularly the table calculated by the Right Honourable George Earl of Macclesfield, for finding easter. Tables of logarithms, sines, and tangents; with their description and use. The whole in a most easy and plain method; designed for the use of schools, and the benefit of carpenters, joyners, bricklayers, and other artisicers, to whom the practical mathematics are of great and immediate use. To which are added, by way of appendix, cycles of the primary planets, never before published: with Mr. Whiston's cycle for the calculation of solar eclipses without parallaxes. By John Potter.