Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 316
FiG. 663. Fig. 664. mining the sag below this level is the distance along the horizontal line fromthe wheel to the point at which it again intersects the rope. This point maybe ascertained by hanging a wire in place on the wheels before splicing the rope. If the difference of level is very great,…
Mechanical drawing
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