Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 154
tions of the two oblique faces D E and F G will obviouslybe each projected in two arcs of an ellipse, whose major axis d g is equal toe f, and minor axis the vertical projection of e f. As it is necessary todraw small portions only of these curves, the following method may be em-ployed : Draw D G…
Mechanical drawing
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