Fahie, J. J. (John Joseph), 1846-1934 · London, J. Murray · leaf 67
formations ofarmies, and finding the mean proportional. Stereometrical lines, for the proportional reduc-tion of similar solids, the extraction of the cuberoot, the finding of two mean proportionals, and forthe transformation of a parallelepiped into a cube. ^ So say Viviani and Gherardini in their… … i6io] GEOMETRICAL COMPASS 43 Metallic lines, for finding the proportionalweights of metals, and other substances, for trans-forming a given body into one of another materialand of a given weight. On the other side of the Instrument are : Polygraphic lines, for describing regularpolygons, and…
