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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 ?
Industry experts said that maritime firms were expected to scrap more than 30 million deadweight tons in 2011, surpassing 26.6 million in 2010 and the figure of 28.3 million in 2009.
"Corona Lions" Specifications Loa: 229.93M Beam: 38.00M Depth: 19.90M Deadweight Tons: about 85,600MT Hold/Hatch: 5/5
It is 950 feet long and has a displacement of 58,000 deadweight tons. The vessel carries a crew of 20 civilian merchant mariners.
Still, the forecasts equate to a requirement for vessels with total capacity of 161.8 million deadweight tons, against the fleet's 194.6 million tons, Clarkson said.
It has a carrying capacity of 117,000 deadweight tons and travels at speeds of 14 knots.
In the first five months, Chinese shipbuilderss completed 12.16 million deadweight tons (DWT), 61% up from same period last year, while the new ship orders totaled 1.18 million DWT , down 96% year-on-year.
The company has agreed to acquire a modern secondhand Capesize vessel from an unaffiliated third party, built in 2010 at Daewoo Shipbuilding in South Korea with a cargo-carrying capacity of approximately 180,000 deadweight tons for a gross purchase price of $28.7M.
On a fully-delivered basis, Golden Ocean's fleet will have an aggregate carrying capacity of approximately 10.4m deadweight tons and an average age of less than five years.
AFRA uses a scale that classifies tanker vessels according to deadweight tons, a measure of a ship's capacity to carry cargo.
The China-based company and Zhuhai Port Holdings Group Co are jointly developing pipelines, an oil berth for vessels of up to 300,000 deadweight tons, and oil storage tanks with a total capacity of three million cubic metres.