tabula in naufragio

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
TABULA IN NAUFRAGIO, Eng. law. Literally a plank in a wreck. This figure has 
been used to denote the condition of a third mortgagee, who obtained his 
mortgage without any knowledge of a second mortgage, and then, being puisne, 
takes the first encumbrance; in this case he shall squeeze out and have 
satisfaction before the second. 2 Ves. 573; 2 Fonb. Eq. B. 3, c. 2, Sec. 2; 
2 Ventr. 337; 1 Ch. Cas. 162; 1 Story, Eq. Sec. 414, 415; and Tacking. 
    

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