bascule

Noun

bas=cule

WORDNET DICTIONARY

bascule(n = noun.artifact) - a structure or device in which one end is counterbalanced by the other (on the principle of the seesaw);

bascule, n. [F., a seesaw.].

In mechanics, an apparatus on the principle of the seesaw, in which one end rises as the other falls. [1913 Webster]

Bascule bridge, a counterpoise or balanced drawbridge, which is opened by sinking the counterpoise and thus lifting the footway into the air.