Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 448
rs of theThird Avenue bridge across theHarlem River, of which Fig. 1030is a section. It conists of a pipe in two sections; the upper one is called the air-lock, which can be connectedwith either the lower chamber or the atmosphere. The lower chamber beingunder pressure and shut off from the… … Fig. 1027.
Mechanical drawing
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