N. B. THE principal alterations in the second vol ume with respect to the first edition, beside its being made to begin with Mensuration of Solids, are the addition of Demonstrations in Notes to nearly all the Problems in Mensuration of Solids, and in Gauging, and of some Questions for practice at the end of Spheric Trigonometry; and the omission of two of the most complex and least useful Problems in Dialing. General Properties of Spheric Triangles Rectangular Spheric Trigonometry MENSURATION OF SOLID S. DEFINITIONS. SOLIDS, 1. OLIDS, or BODIES, are figures, having length, breadth, and thickness. 2. A prism is a solid, or body, whose ends are any plane figures, which are equal and similar; and its sides are paral lelograms. A prism is called a triangular prism, when its ends are triangles; a square prism, when its ends are squares; a pentagonal prism, when its ends are pentagons; and so on. |