Bascule leaf | Article about bascule leaf by The Free Dictionary
bascule leaf[′ba‚skül ‚lēf]
The span of a bascule bridge.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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These were removed during the restoration and operational balance maintained by adjusting the level of 20 ft x 4 ft x 2 ft water tanks mounted temporarily to the nose of the bascule leafs