Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 345
Fig. 138. CHAPTEE XXVII LINES CONTAINED BY PLANES AND MAKING GIVEN ANGLESWITH THE CO-ORDINATE PLANES The principles on which solutions of this combination of figuresare based will be more easily understood by reference to theperspective view (Fig. 139). A, B, and C represent planes inclined to both… … Fig. 139. point in this line. If now a perpendicular be let fall from a tillit meets the H.P., and a right-angled triangle with an angle Q atits base sweep out a semi-cone round this perpendicular line asan axis, the base of this semi-cone will intersect the plane A,provided the angle Q be not…
Geometrical drawing
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