mar'gin line"

1. an imaginary line used in making calculations regarding the flooding of hulls, running fore-and-aft 3 in. (8 cm) below the upper surface of the bulkhead deck at the side.
2. the line along which the planking on a transom-sterned vessel terminates aft.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

margin callmargin plank


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