An accurate system of surveying ; in which is contained, I. Decimal fractions. II. The extraction of the square-root. III. Plane trigonometry. IV. An exact method to cast up the contents of lands. V. Field surveying. The whole being performed without the use of scale and compasses, or a table of logarithms. In which is given, some account of the variation of the needle, and the causes of its attraction / By Samuel Moore.