. Memoirs and proceedings of the Manchester Literary & Philosophical Society. » Q Fig. 13. Trisection Dividers. obvious, provided that the radius of the circle be madeequal to the distance PQ. II. The angle ABC in Fig. 14 may be trisected by H A. Fig. 14. Method of Jordanus. 22 Gee AND ADAMSON, Trisecting an Angle. drawing BH perpendicular to BC and placing a straightline AKE through A so that the intercept KE is equal tothe radius of the circle. BG, drawn parallel to AKE isthen a trisector. (Compare with Figs. I and 5.) Thismethod is given by a monk, Jordanus Heaccomplished the
. Memoirs and proceedings of the Manchester Literary & Philosophical Society. » Q Fig. 13. Trisection Dividers. obvious, provided that the radius of the circle be madeequal to the distance PQ. II. The angle ABC in Fig. 14 may be trisected by H A. Fig. 14. Method of Jordanus. 22 Gee AND ADAMSON, Trisecting an Angle. drawing BH perpendicular to BC and placing a straightline AKE through A so that the intercept KE is equal tothe radius of the circle. BG, drawn parallel to AKE isthen a trisector. (Compare with Figs. I and 5.) Thismethod is given by a monk, Jordanus Heaccomplished the trisection by giving a ruler simul-taneously a rotating and sliding motion, its final positionbeing fixed with the aid of a certain length marked onthe III. Alsidschzi12 used the following method: Let ABCbe the angle {Fig. 15) to be trisected. With B as centre
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1888
