Paper folding and cutting; a series of foldings and cuttings especially adapted to kindergartens and public schools (1892)
Ball, Katherine M · Boston, The Prang educational company · leaf 36
THE TREFOIL. Fold to Fig. 4, and cutfrom I to 2. Point 2 is theintersection of the line 3-0and the arc. The arc shouldbe a semicircle, having itscentre on the line i-o. … THE TREFOIL. Fold to Fig. 4, and cutfrom I to 2. The arc 4-1should be a quadrant, with 3as centre. The line 2-4-1must be at right angles with5-0.
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