Aruler used by draughtsmen for ruling long lines for which the T square cannot be conveniently employed; the converging lines of a large perspective drawing. It is usually of light, hard wood, but hard rubber and celluloid are also used. 2. An implement used in building, for various purposes. For laying off long lines and for testing the evenness of a planesurface of plasterorstone, a thoroughly seasonedboardwithan edged planed perfectly true is employed… (Sturgis, 1900)
