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 351
es of a plane to contain three given pointsA, B, and C would be found in the same manner. CHAPTEE XXYIII KOTATION OF PLANE FIGUKES In the projection of various objects the necessity for rotatingplane figures at any required angle with the co-ordinate planesis of frequent occurrence. The following… … Fig. 147. Draw a line through point a of the figure, perpendicular toXY. Assume this line to be the H.T. of the required projection. CHAP. XXVIII ROTATION OF PLANE FIGURES 331 Where this Hue meets XY in A, set off the required angle, whichgives the line H. This is the V.T. of the required…
Geometrical drawing
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