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TONNAGE, mar. law. The capacity of a ship or vessel.
     2. The act of congress of March 2, 1799, s. 64, 1 Story's L. U. S. 630, directs that to ascertain the tonnage of any ship or vessel, the surveyor, &c. shall, if the said ship or vessel be double decked, take the length thereof from the forepart of the main stem, to the afterpart of the stern post, above the upper deck, the breadth thereof, at the broadest part above the mainwales, half of which breadth shall be accounted the depth of such vessel, and then deduct from the length three-fifths of the breadth, multiply the remainder by the breadth and the product of the depth, and shall divide this last product by ninety-five, the quotients whereof shall be deemed the true contents or tonnage of such ship or vessel. And if such ship or vessel shall be single decked, the said, surveyor shall take the length and breadth as above directed, in respect to a double deck ship or vessel, and shall deduct from the length three-fifths of the breadth, and taking the depth from the underside of the deck plank to the ceiling of the hold, shall multiply and divide as aforesaid, and the quotient shall be deemed the tonnage of such ship or vessel.
     3. The duties paid on the tonnage of a ship or vessel are also called tonnage.
     4. These duties are altogether abolished in relation. to American vessels by the act of May 31, 1830, s. 1, 4 Story's Laws U. S. 2216. And by the second section of the same act, all tonnage duties on foreign vessels are abolished, provided the president of the, United States shall be satisfied that the discriminating or countervailing duties of such foreign nation, so far as they operate to the disadvantage. of the United States, have been abolished.
     5. The constitution of the United States provides, art. 1, s. 10, n. 2, that no state shall, without the consent of congress, lay any duty on tonnage.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
(53) Of the accounts I examined, nine were petty customs accounts and two were tunnage and poundage accounts, with eight petty accounts and one tunnage and poundage account containing book imports.
Its power, such as it was, consisted of an ability to deny the king those things that he wanted to obtain, such as the Union, subsidies or a formal grant of Tunnage and Poundage.
(24) Tunnage and poundage customs, London, E122 78/7, 1488-89.
The 24-year-old, from Bangor, in North Wales, died after suffering a blow to the head on November 15 last year in Tunnage Square passageway.
He and two friends entered the Tunnage Square passageway.
The 24-year-old was killed in Tunnage Square passageway outside Nation nightclub on November 15 last year.
She said as they walked into the Tunnage Square passage, they were set upon by four men who Mr Lunne and Mr Evans had clashed with repeatedly, both earlier that night and in the weeks before.