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 65
STEREOGRAPHY— PROJECTION. 49 a b c d, a' b' c d' (Fig. 256) be the projections of the llie projections of a plane and of a 'point being given , lines: from e draw indefinitely, Fig. 256. … To determine, from the projection of two lines which tion of k l' is H I, and its vertical projection k l' ; and as intersect each other in the projections, whether the lines the point D is in k' l', its horizontal and vertical projec¬ cut each other in space or not. tions will be d and cl’.…
