rolling chock

rolling chock

[′rōl·iŋ ′chäk]
(naval architecture)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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A cross swell had set in from the direction of Formosa Channel about ten o'clock, without disturbing these passengers much, because the Nan-Shan, with her flat bottom, rolling chocks on bilges, and great breadth of beam, had the reputation of an exceptionally steady ship in a sea-way.