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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 ?
The new ore port, with capacity of 25 million tonnes, will be accessible to vessels of more than 180,000 deadweight tonnage. It should cut ocean freight costs by speeding up loading and reducing the time spent by vessel in the port: the loading rate will increase from 3,500 tonnes an hour to 7,500, cutting stays by 30-40 hours.
But dwt also stands for deadweight tonnage; I don't say that this is significant in Oddly's case, but it might cause a nightmare or two among cash-typemill-dispensing Beebers.
DWT stands for deadweight tonnage, a measure of the weight a ship can carry.
Deadweight tonnage is approximately 79,000 tons, with a total tank holding capacity of 177,000m3.
Phases I, II & IIA deal with the repair of medium- to large-sized ships (20,000 to 400,000 dwt -- or deadweight tonnage) and conversions; Phase III deals with fabrication and maintenance of offshore structures; Phase IV and IVA involve the construction and refit of high-value small ships, including yachts; Phase V is about the repair of small ships; and Phase VI involves the construction and maintenance of fibreglass reinforced plastic vessels.
The tie-up will position CPLP as the eight largest US public sector firm by deadweight tonnage (dwt), with a pro forma market capitalisation of about USD800m and a pro forma public float of more than USD500m, the companies said.
About 460 meters long jetty will have a depth of 15 meters to handle large ships of upto 75,000 deadweight tonnage. This will be connected to a back up area of 25 hectares with a 2.5 kilometers trestle.
The 319,000 deadweight tonnage Samho Dream, which was built in 2002, is carrying crude oil that could be worth as much as $170 million at current oil prices.
The 46,200 deadweight tonnage (DWT) chemical carriers from the Hyundai shipyard in Ulsan in South Korea are chartered to Saudi petrochemicals giant Sabic for 15 years.
Deadweight tonnage is approximately 80,300 tons, with total tank holding capacity of 180,000m3.
The average deadweight tonnage of the delayed ships was 90,936 mt.