Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 530
ENGINEERING DRAWING. 513 Figs. 1224 to 1228 are illustrations of a landing-bridge common at NewYork city ferries. Fig. 1224 is a longitudinal section, showing a section of the float,/, with its lever shown at oneside of the float and stone coun-terpoise to balance the weight of thebridge. Fig. 1225… … Fig. 1229. Fig. 1230. worked by hand-wheels; on the outer ones are the chains by which the boat isdrawn up to the bridge; on the inner ones the chains by which the bridge isadjusted to the load on the boat, and by which a part of the weight of thebridge is held, the upper ends of the chains being…
Mechanical drawing
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