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 315
Fig. 98. angle at 6 as radius, draw an arc till it meets a perpendicularfrom a. Join ha, which is the required plan. 294 SOLID GEOMETRY Problem 77. The plan and elevaMon of an angle ach, acb being given, to findits traces and true angle. Fig. 99. Produce ca and ch till they meet XY in A and B;… … Fig. 99. These are the traces of the lines. Join the two H.Ts. by a line,and through c draw the line CD perpendicular to it. Draw theprojector cc, and from E set off EF equal to cD. Join Fc. Setoff from D a length equal to Fc, which determines the pointC. Join C to each H.T. Then the angle at C is…
Geometrical drawing
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