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 218
AHAHAC : AF : af :B F or a : ACBFHCHC d. BF,HC,AB,AB, *#* (590) There are various other mechanical solutions for thiscelebrated problem. We shall, however, only mention the contrivanceof Descartes, by which any number of means may be found betweentwo given extremes. liOOK THE SIXTH. 199 … Let A B C be two rulers, united at their extremities B by a pivoton which they turn. In each of theserulers is a groove in which severalrulers D d, E e, Ff, &c. move so as tobe always perpendicular to the groovedrulers respectively, and so that theperpendicular D d nearest to B, uponopening the…
Geometry
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