piston corer

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piston corer

[′pis·tən ¦kȯr·ər]
(mechanical engineering)
A steel tube which is driven into the sediment by a free fall and by lead attached to the upper end, and which is capable of recovering undistorted vertical sections of sediment.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Through the use of shallow piston corers, we have successfully collected 12 sediment cores up to 4 m in length from Weeks Bay, a small estuary located in Baldwin County, Alabama.