Tonnage

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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 ?
By March 1997, Pakistan National Shipping Corporation (PNSC) owned only 15 vessels with a total dead weight tonnage of 264,210, less than half of the late 1980's and one-third of the early 1970's, resulting in colossal loss to the government as well as drain on the foreign exchange.
In terms of dead weight tonnage, the Stena HSS is approximately five times as large as the biggest high-speed ferry on the market today.
This port has a huge investment potential in view of the opportunities offered through establishment of the deep sea port capable to accommodate large vessels of up to 70,000 dead weight tonnage (DWT), he said during his visit to Karachi Chamber of Commerce and Industry, said KCCI statement on Wednesday.
The terminal has a 10.5m draught and a jetty capable of handling vessels up to 50,000 dead weight tonnage (DWT).
Named Gulf Muttrah, the IMO II-N2 type 46,000 dead weight tonnage (dwt) vessel, the company is achieving all the targets set for 2009, Ahmed Essa Hareb Al Falahi, CEO of GEM.