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 217
proportions we find AB : AF: CE : C B. *#* (589) Nicomedes, a Greek geometer, who lived about two cen-turies before the Christian era, found that the determination of twomean proportionals depends on the solution of the problem, * To drawa right line passing through a given point and intersecting… … Let A B be a flat ruler in which there is a groove C D. Attachedto the middle E of this is another flat rulerE F, perpendicular to it in which, at I, is afixed pin, which is inserted in the grooveof a third ruler G H, in which there is alsoa fixed pin at K, which is inserted in thegroove C D. The…
Geometry
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![An illustration from Cosmographia Francisci Mavrolyci Messanensis Sicvli : in tres dialogos distincta, in quibus de forma, situ numerʹoq[ue] tam coelorum q[uam] elementorum, alijsq[ue] rebus ad astronomica rudimenta spectantibus satis disseritur (1543)](https://img.insideoutlibrary.com/img/200/ia-cosmographiafran00maur-177-0.webp)