Both Uses of

acquire
in
Moby Dick

These pleadings, and the counter pleadings, being duly heard, the very learned Judge in set terms decided, to wit,—That as for the boat, he awarded it to the plaintiffs, because they had merely abandoned it to save their lives; but that with regard to the controverted whale, harpoons, and line, they belonged to the defendants; the whale, because it was a Loose-Fish at the time of the final capture; and the harpoons and line because when the fish made off with them, it (the fish) acquired a property in those articles; and hence anybody who afterwards took the fish had a right to them.†
Chpt 88-90

acquired = obtained (came into possession of)

For such is the wonderful skill, prescience of experience, and invincible confidence acquired by some great natural geniuses among the Nantucket commanders; that from the simple observation of a whale when last descried, they will, under certain given circumstances, pretty accurately foretell both the direction in which he will continue to swim for a time, while out of sight, as well as his probable rate of progression during that period.†
Chpt 133-135 *

Definition:

obtain (come into the possession of something)