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 295
s subject, should readthe introduction to Solid Geometry (Chap. XVII.), in whichthe principles of the subject are illustrated. In Solid Geometry objects are projected by means ofparallel projectors perpendicular to two co-ordinate planes.These planes may be considered as indefinite in extent.… … Fig. 73, groove, as shown in Pig. 73. By fitting these two pieces togetherwe obtain two planes intersecting each other at right angles,as shown in Fig. 74 CHAP. XXIII ORTHOGRAPHIC PROJECTION 275 We have now four sets of co-ordinate planes, or, as tliey arecalled, dihedral angles. The angle formed…
Geometrical drawing
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