The carpenter and joiner's assistant : being a comprehensive treatise on the selection, preparation, and strength of materials, and the mechanical principles of framing, with their application in carpentry, joinery, and hand-railing : also, a course of instruction in practical geometry, geometrical lines, drawing, projection, and perspective : and an illustrated glossary of terms used in architecture and building (1860)
Newlands, James, 1813-1871 · Glasgow : Blackie and Son · leaf 76
th the radius i g, or i h, and from the cen¬ of the sphere h xiv. Any point whatsoever on the surface of a sphere be¬ tre b' on the vertical projection, describe arcs of a circle, longs to a circle of that sphere : therefore, if a (Fig. cutting the perpendicular c c" c in c and c. Then c beam in… … jection of the given point a, will be found in the cir¬ and on the generating line cumference of the circle described from d' with the radius, e i will, consequently, be and at that point of it where it is intersected by the line found the tangent points of drawn through a, perpendicular to A B.…
