Tonnage 11
Tonnage 11 : The carrying capacity of a ship. Merchant ships are measured for the purposes of assessing dues, but the tonnage so computed conveys little idea of the actual carrying capacity of the ship. There are three designations of tonnage in connection with the British merchant ships, viz. (1) Under Deck Tonnage: Found by ascertaining the total volume of the internal space between the tank top or, where there is no double bottom, the top of the ceiling over the floors and the underside of the tonnage deck and dividing by 100 cubic feet (the unit of measurement per ton). The tonnage deck is defined as the upper deck in all vessels which have less than three decks and the second (complete) deck from below in all other ships. (2) Gross Tonnage: The under deck tonnage plus the tonnage of all enclosed spaces above the tonnage deck (subject to certain exemptions). (3) Net Registered Tonnage: The remaining tonnage after allowances for crew spaces, navigation space, machinery and propelling power spaces, etc. have been deducted from the gross tonnage. Ships passing through the Suez and Panama Canals have to be specially measured to comply with their regulations for ascertaining tonnage upon which the dues are paid
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