American text books of art education : Geometrical drawing (1873)
Smith, Walter, 1836-1886 · Boston : James R. Osgood & Co. · leaf 67
. Prob. 68.—At a point C in the line A B, to male an angle of 60°,I; 45°, 30, or 15°. Draw any line A B. With centre C and with any radius, de-scribe an arc, cutting A B in I; with centre I, same radius, cut theIt arc in D; draw D C ; it will make an angle of 60° with A B. Bisectangle D C A by line…
Geometrical drawing
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