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 78
Fig. 134. Peoblem 80. THE TREFOIL. In a given equilateral triangle ABC, to inscribe a trefoil. Bisect the angles CAB and ABC by lines produced till they meet the sides of thetriangle in D and E (Prob. 13).From C, through centre L, drawthe line CF. Join DE, EF, andFD. From G draw GI perpen-dicular…
Geometrical drawing
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