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 305
Let ah represent the horizontal projection, and cth thevertical projection. 284 SOLID GEOMETRY chap. Produce ah till it meets XY in E. From E let fall a lineperpendicular to XY. Produce ah till it meets the perpendicular aJ h HT IVT /^ •■F S L r, A c K i .■ht\ \. i h \ \ \. ! % -VT \cZ Fig. 86.… … Fig. 87. dihedral angle, the V.T. must in this instance be on the V.P.below the H.P. This will be better understood by referring to XXIII ORTHOGRAPHIC PROJECTION 285 Fig. 87, where the problem is shown in perspective, with theaddition of the original line AB from which the projections aretaken. The…
Geometrical drawing
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