Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 462
ides set in grooves in the stone ; in front of these grooves there isanother set of grooves {g g), which are intended for slip-planks or gates, to beput in whenever it is necessary to shut off the water from the gates themselvesin case of repairs. Hoisting Apparatus.—To each gate there are strongly… … 446 ENGINEERING DRAWING.
Mechanical drawing
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