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 273
c draw the line eh at right angles to OA, and draw 252 SOLID GEOMETRY the line ck perpendicular to ch. With c as centre, and radinsef, draw an arc till it meets cli in k. Join kl. elk then givesthe angle A; and the triangle elk represents a section throughthe other half of the trihedral angle,… … Fig. 58. The points d and h will be found to be equidistant from 0. To obtain the angle B. Take any two points m and n equi-distant from 0, and at these points draw the lines mo and npperpendicular to the lines OB and OB till they meet the linesOC and OA in 0 and p. Join op. With 0 as centre, and…
Geometrical drawing
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