Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 487
r by inclines, the object being to se-cure space in the sewer, and save the rock excavated for other city purposes.Fig. 1111 represents the first joint from the sewer on house branches curved and with a cover by means of which anyobstruction in sewer or branch couldbe better reached and removed.…
Mechanical drawing
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