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Related to tonnages: Net Tonnage, Deadweight 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 ?
Every year of the "but for" projection was based on the 1,609 actual 1981 tonnage, since the plaintiff alleged price fixing began to occur in 1982.
The "but for" tonnage and prices were multiplied to estimate "but for" revenues (see exhibit 2, columns A to D, page 86).
Tonnage information that is received after the publishing deadline will appear in the monthly "Around the World" department of modem casting.
This transaction allows us to buy developed tonnage at a cost of about $1 per ton of established reserves plus great exploration potential in a known mining district.
Tonnage for energy products was up 11 percent from a year earlier.
Fabricated products tonnage dropped three percent from the first quarter but was a healthy 21 percent ahead of the year earlier period.
This noticeable increase in the numbers and tonnage of ships reflects the importance of establishing the new Suez Canal to increase the Canal's capability of receiving the expected increase in world trade passing through the Suez Canal," said Mohab Mamish, Suez Canal Authority Chairman.
A host of paper stock dealers were frantically looking to lock in tonnage as demand surged.