practical working, weight, Q, is a smaller one, P, with a pulley, a, se- as may bo found necessary. By reference to Fig. 1 as each requires to be opened and closed by an at- cured to its upper end, and through which the chain it will be noticed that when a boat is passing through passes freely. The… … roadway is then open for carriages and passengers to of the swing platform, and Fig. 3 is a section top up the slack of the chain when the bridge is turned in cross. Such bridges are also well adapted for all nav- view, showing the adaptation of the bridge to a double either direction. igable…
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