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Spring-beam.


1. (Shipbuilding.) The foreand-aft timber uniting the outer ends of the paddle-box beams. The sponsons are curved timbers uniting the spring-beam to the sides, fore and aft of the paddlebox.

2. An elastic bar at the top of a tilt-hammer, mortising-machine, or jig-saw, to accelerate the fall or give the return motion, as the case may be.


3. (Carpentry.) A beam stretching across a barn without a central support, so as to leave the two bents of the barn floor free for various uses.

Spring dirk-knife.

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