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 324
ill be moreeasily understood byreferring to the set-square B (Fig. 107). Let Op represent a line at right angles to on\ and perpen-dicular to the plane B. Then op is the horizontal projection,and op the vertical projection of this line (Op) ; and the H.T. mo,and the V.T. 7nn, are at right angles to… … Note.—The angles in this problem are the same as those 304 SOLID GEOMETRY CHAP. XXIII
Geometrical drawing
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