Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 161
reased by the use of shade lines; themethod is wholly conventional. The ruleused in preparing drawings for the UnitedStates Patent Office is the simplest and the one generally used in this country.In this the light falls from the upper left-hand corner of the sheet of drawing-paper, and at an angle… … FiG. 285. ORTHOGRAPHIC PROJECTION. 145
Mechanical drawing
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