A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 96
ing.^ 3. Proh,—Through a givenpoint to draio a line parallel to agiven lin^, upon the pri7iciple thatthor alternate angles made hy asecant line are equal {152). 4. A bevel is an instrument muchused by carpenters, and consists ofa main limb AB, in which a tonsfue CD is placed, so as to open and shut… … 76 ELEMENTARY PLANE GEOMETRY. to allow a greater or less portion to extend on a given side, as CB, ofthe limb. Now, suppose the tongue fixed in position, as represented inthe figure, and the side in of the limb to be placed against thestraight edge of a board, and slid up and down, while lines are…
Geometry · Trigonometry
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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)
