Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 77
Fig. 160, 60 DRAWING INSTRUMENTS. responding squares, and draw the connecting lines. To enlarge or reducethe design, make the squares or triangles proportionately larger or smaller. 3 4 … Fig 162. Fig. 163.
Mechanical drawing
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