An Easy Introduction to Fortification and Practical Gunnery: Containing, I. Decimal Arithmetic, Extraction of Roots. II. The Laws of Motion; of Gravity. Descent of Heavy Bodies. Vibration of Pendulums. III. Geometrical Problems, and Some of the Most Useful Theorems in Geometry Demonstrated in a Very Plain and Easy Way. IV. The Measuring of Superficies. V. The Measuring of Solids. Of the Strength of Beams of Timber, with Rules for Cutting Scantlings for Buildings, from Mathematical Principles. VI. The Computation of Balls and Shells. Vii. Logarithmical Arithmetic. Viii. Plane Trigonometry, the Proportion of Sines, Co-fines, Tangents, &c. With Many Useful Problems for Finding Heights and Distances, &c. Copiously Handled. IX. Fortification, Explaining the Terms, with Rules for Fortifying Any Regular Polygon, from the Square to the Decagon, and All the Sines and Angles Computed by Trigonometry, with the Operation at Large. X. Gunnery, where the Cases are Solved by Addition and Subtraction Only, with Numeral Examples; the Rules in Words at Length, Whether the Projections be Made on Horizontal, Or on Ascending Or Descending Planes. The Theory of Projectiles. Tables of Experiments of Cannons and Mortars, with Some Observations. The Solution of a Problem to Find the Velocity of a Bullet Shot from Any Piece of Ordnance; with the Necessary Tables. ...