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 325
Note.—The angles in this problem are the same as those 304 SOLID GEOMETRY CHAP. XXIII … Fio;. 112. given in tlie preceding one, so that a comparison can be madebetween them. The angles that a line perpendicular to the plane will makewith each plane of projection must first be determined. The plane is to form anangle of 60° with the H.P., soa line perpendicular to it willform an angle…
Geometrical drawing
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