Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 228
Practically, the drawing of one line parallel to anotheris usually effected by means of a parallel ruler (seepage 191), or by the use of draftsmenstriangles, as here shown, or even morecommonly by the use of a T-square,such as is here seen. This illustrationshows two T-squares used for draw-ing…
Geometry
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
