Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 77
Fig 162. Fig. 163. … Fig. 164. In transferring designs and drawings from books or plates, on which squarescan not be drawn, it is very convenient to have a square of glass, with squaresupon it, which may be laid on the drawing, and thus serve the same purpose as if squares had been drawn. Theglass may be readily…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
