Appletons' cyclopædia of technical drawing : embracing the principles of construction as applied to practical design ... (1896)
Worthen, W. E. (William Ezra), 1819-1897 · New York : D. Appleton · leaf 172
jection of d atd by a ray of light from c; d1 is the high-est point in the curve. Take any horizon-tal line E F in the elevation and describefrom C on the plan an arc with a radius equal to one half this line; draw from C a ray intersecting E F at e, whichproject to e, and from e as a centre… … FIG. 320.
Mechanical drawing
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