A text-book of geometrical drawing, for the use of mechanics and schools, in which the definitions and rules of geometry are familiarly explained .. (1850)
Minifie, William, 1805-1880. [from old catalog] · Baltimore, W. Minifie & co. · leaf 92
a right angled triangle about one of its sides.2nd. If both legs of the triangle are equal, as S. JV* and JY. 0, fig. 2, it would generate a right angled cone ; the angle S being a right angle.3rd. If the stationary side of the triangle be longest, as M, JV*, the cone will be acute, and if… … B A PLATE XIX. 45 5th. The axis of a cone^ is a line passing from the vertex to thecentre of the base^ as M/JV, figs. 1^ 2^ 3 and 4, and representsthe hne about which the triangle is supposed to rotate. 6th. A RIGHT CONE. When the axis of a cone is perpendicularto its base^ it is called a right…
