Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 486
s of vitrified ware which are sold for this purpose.Fig. 1109 is a section of a sewer constructed in situ at Mount Vernon, N. Y.,through a long rock-cut. Concrete was rammed in around an inverted centre,and after it was withdrawn the face was plastered with a very thin coat of Equal to acircular D… … Fig. 1108. Portland cement; the invert is of vitrified ware. A plumb i is inserted acrossthe sewer (Fig. 1110) with points for centres at different heights, the radiusis uniform, and the arch turned as high as convenient for the rock sides and
Mechanical drawing
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