Section 66

Whenever the tonnage of any ship has been ascer-tained and registered under this Part, that tonnage shall thenceforth be deemed to be the tonnage of the ship, and shall be repeated in every subsequent registry thereof, un-less any alteration is made in the form or capacity of the

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Merchant Shipping ship, or unless it is discovered that the tonnage of the ship has been erroneously computed; and in either of those cases the ship shall be remeasured, and her tonnage determined and registered in accordance with this Part.