Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 155
he part above M W is exactly symmetrical with thatbelow it, the distribution of the letters of reference in the figures can lead to noconfusion. The intersection of the plane F G with the cone is projected horizontallyin a circle described from the centre C, with the diameter F G. The arcsI F A and… … Fig. 276. ORTHOGRAPHIC PROJECTION. 139
Mechanical drawing
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