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Related to tonnage: Deadweight tonnage, Net Tonnage
See: cargo

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.

References in periodicals archive ?
Now we have a starting point to determine what clamp tonnage is correct for this mold.
This could be due to the increase in the overall gross tonnage in the fleet which could have led to the increase of the tonnage tax.
Carriers continue to tell LM that demand and tonnage remain fairly decent, especially when taking the slowly recovering economy and seasonality components into account.
The United States Supreme Court in Polar Tankers held, in a 7-2 opinion (though the simplicity of that figure obscures the fact that the Court split along multiple lines), that a tax imposed by the City of Valdez, Alaska, on ships making use of its harbor was an unconstitutional levy imposed for the privilege of using Valdez's ports, and was consequently a violation of the Tonnage Clause.
Nearly a full year under the new policy resulted in the town receiving more than $230,000 for the amount of unused free tonnage and $92,000 for the per-ton fee the town charged the local haulers for trash brought to Wheelabrator, for a total of about $322,000.
tie bar tonnage control that requires mechanical adjustment of the diecasting machine to vary tonnage.
The new system will remain in place to the end of 2007 and will offer a 10% discount on additional tonnage provided by a carrier over and above that provided in the corresponding summer or winter schedule.
The number of gas tankers had remained unchanged from 2001 to 2002, but the gas tankers tonnage had increased by 7% and the supply vessel tonnage by 18%.
Containerized cargo tonnage has been making impressive gains since 1990, growing 80 percent from 1990 through 2000 when total waterborne commerce tonnage exceeded 23 million tons.
Singapore expects to keep its title as the world's busiest port as the total tonnage of ships which called last year rose to 877 million gross tons, the Maritime and Port Authority of Singapore (MPA) said Tuesday.
There had been speculation Mr Brown might introduce a tonnage tax for ships on the UK register designed to halt the practice of companies sailing vessels under foreign flags with overseas crews.