The first six books of the elements of Euclid : with a commentary and geometrical exercises ; to which are annexed a treatise on solid geometry, and short essays on ancient geometrical analysis, and the theory of transversals (1861)
Lardner, Dionysius, 1793-1859 · London : Print. for Taylor and Walton · leaf 338
ays of an harmonic pencil whose axis is kf. Andin the same manner any pair of diagonal lines form with the line F Prays of an harmonic pencil whose axis is the line drawn from / tothe intersection of the diagonal. Theorem. (40) I/F,fbe the foci of two harmonic pencils whose common axis is¥f the… … Fxy Fa:, Fxw, and fx, fy, fz being each three rays of two har-monic pencils whose common axis is Ff, the points a?, yf, z must bein the same right line (36). And in the same manner u, xf, y, z, x, y, z\y,z> must be severally in the same right line. Also the several series ofIntersection. 332…
Geometry
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