Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 93
^^ -5^ k 7 ^ t> \ 1 ^ 1 / / ^/ ^ … MECHANICAL DRAWING 53 Proof. The angle P C O is inscribed in a semicircle and henceis a right angle. Since P C O is a right angle, P C is perpendicularto C O. The perpendicular to a radius at its extremity is tangent tothe circumference. Inking. In inking Plate VI, the same method should be…
Architecture · Building
Internet Archive · Kelly Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
