A text book of geometrical drawing : abridged from the octavo edition : for the use of schools in which the definitions and rules of geometry are familiarly explained, the practical problems are arranged from the most simple to the more complex, and in their description technicalities are avoided as much as possible : with an introduction to isometrical drawing : and an essay on linear perspective and shadows ... (1849)
amid. When the base of apyramid is perpendicular to its axis, it is called a rightpyramid; if they are not perpendicular to each other,the pyramid is oblique. If the top of a pyramid be cutoff, the lower portion is said to be truncated ; it is alsocalled dijrustrum of a pyramid, and the upper… … Tiif. 3.
