| 单词 | register tonnage |
| 释义 | > as lemmasregister tonnage Originally the number of tun casks of wine which a merchant ship could carry. Afterwards estimated by measurements and calculations which gave rough approximations to the actual cubic content (Old Measurement). Later arrived at by measurements of breadth and depth at determinate distances, from which by a mathematical calculation (see Merchant Shipping Acts from 1854 onward, and subsequently Merchant Shipping (Tonnage) Regulations) the cubic content of the space under the tonnage-deck ( under-deck tonnage) is obtained. To this is added the volume of certain specified enclosed spaces above this deck, the result being the gross (register) tonnage. A deduction is made from the latter for those parts of the ship which are deemed to be non-earning, to give the net (register) tonnage or register tonnage, for which vessels are registered, and on which the assessment of dues and charges on shipping is based. Systems of measurement vary from country to country, but there have been moves towards international standardization. The Suez Canal tonnage makes a smaller deduction for engine-space, etc., and approximates more closely to the gross tonnage.extracted from tonnagen.< as lemmas |
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