Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 175
Fig. 322. and A E, as well as to those of the helix F G H and the edge H I. The shadowof the two edges J K and K L, thrown upon an inclined helical surface, ofwhich A L is the generatrix, follows the rules given in Fig. 323. … Fig. 323. SHADES AND SHADOWS. 159 In the case of a triangular-threaded screw (Fig. 323) the outer edge, A C D,of the thread projects its shadow upon a helical surface inclining to the left, ofwhich the generatrix is known. Describe from the centre 0 a number of circles representing the bases of…
Mechanical drawing
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