A textbook on mechanical and electrical engineering (1898)
International Correspondence Schools · Scranton : International Textbook Co., [1898-99] · leaf 317
ction isexactly the same. In a similar way, a sur-face is projected upon aflat surface. Thus, it is desired to project the irregular surface a b d c,Fig. 103, upon the flatsurface ABDC. Drawthe lines aa\ b b perpen-dicular to the flat surface;join the points a and bwhere these perpendicu-lars… … SYMMETRICAI. AND Sl.MILAR FIGURES. 1 8(). An axis of symmetry is any line so drawn that, if the part of the figure on one side ofthe line be folded on this line, it willcoincide exactly with the other part,point for point and line for line. Thus,in Fig. 104, if the upper half be foldedover on the…
Electrical engineering · Mechanical engineering
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
