Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 158
ORTHOGRAPHIC PROJECTION. 141 … -\ The lines A K, B L, C M, etc., represent the horizontal projections of thevarious positions of the generating straight line, which, in the present example,has been supposed to behorizontal; and these linesare projected vertically atA^ K, B L, etc. In the position A Kthe generating line is…
Mechanical drawing
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