Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 475
on given is the general one, resting on concrete,brick lining at sides and invert at bottom, with an 8 arch at top for a 4 cover,and 12 for exceptional depths or under railway-tracks. The lower cornerswere of special brick. The inclination of the conduit is 1 foot per mile, and the flow…
Mechanical drawing
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