Bascule bridge
a device operating like a balance or seesaw, especially an arrangement of a movable bridge (bascule bridge) by which the rising floor or section is counterbalanced by a weight.
historical examples
the cost has been set down at 65,000, or about one-thirtieth that of a suspension bridge, and one-third that of a bascule bridge.
the romance of modern mechanism archibald williams
noun
also called balance bridge, counterpoise bridge. a bridge with a movable section hinged about a horizontal axis and counterbalanced by a weight compare drawbridge
a movable roadway forming part of such a bridge: tower bridge has two bascules
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