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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 ?
8% of tonnage carried by all modes of domestic freight transportation, including manufactured and retail goods.
Wheelabrator reimbursed the town for the unused tonnage at the Tier I rate, which is $36.
real-time tonnage of tie bars is individually and automatically controlled.
Our steel tonnage imports nearly doubled when compared to the previous year, reaching 213,000 short tons.
The shipping tonnage of 877 million gross tons last year was 2.
There is a great feeling of disappointment that the tonnage tax was not included in the range of incentives to boost industry and enterprise," said Jimmy Knapp, general secretary of shipping union, the RMT.
These include that the tax violates the Northwest Ordinance and the Virginia Compact, as well as the Duty of Tonnage, Supremacy and Commerce Clauses of the U.
If other cities fail to join, Simi Valley officials also have said they may be forced to turn to Los Angeles County for additional tonnage.
The "but for" tonnage projection is shown in column E of exhibit 1 below.
Year-to-date through September, compared with the same period last year, tonnage was up 3.
5 billion yuan (US$ 402 million) to construct nine public service vessels, including five ships with a tonnage of 3,000 tons and four ships with a tonnage of 5,000 tons.