The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

rr THOMPSON'S COAST PILOT. 125 all the other odd numbered breadths (except the first and last), by two; to the sum of these products add the first and last breadths, multiply the whole sum by one-third of the common interval between the breadths, and the result will give, in superficial feet, the mean horizontal area of such space; measure the mean height between the plank of the two decks, and multiply by it the mean horizontal area, and the product will be the cubical contents of the space; divide this product by one hundred, and the quotient shall be deemed to be the tonnage of such space, and shall be added to the other tonnage of the vessel, ascertained as aforesaid. And if the vessel has more than three decks, the tonnage of each space between decks, above the tonnage deck, shall be severally ascertained in the manner above described, and shall be added to the tonnage of the vessel, ascertained as aforesaid. TONNAGE OF OPEN VESSELS, HOW ASCERTAINED. In ascertaining the tonnage of open vessels, the upper edge of the upper strake is to form the boundary line of measurement, and the depth shall be taken from an athwartship line, extending from upper edge-of said strake at each division of the length. | REGISTERED TONNAGE TO BE CARVED ON THE MAIN BEAM. | The register of the vessel shall express the number of decks, the tonnage under the tonnage-deck, that of the between-decks, above the tonnage- deck; also that of the poop or other inclosed spaces above the deck, each separately. In every registered United States ship or vessel the number denoting the total registered tonnage shall be deeply carved or otherwise permanently marked on her main beam, and shall be so continued; and if it at any time cease to be so continued, such vessel shall no longer be recognized as a registered United States vessel. CHARGE FOR MEASURING AND CERTIFICATE. Sc. 4. And be it further enacted, That the charge for the measurement of tonnage and certifying the same shall not exceed the sum of one dollar and fifty cents for each transverse section under the tonnage-deck ; and the sum of three dollars for measuring each between-decks above the tonnage- deck ; and the sum of one dollar and fifty cents for each poop, or closed-in space available for cargo or stores, or for the berthing or accommodation of passengers, or officers and crew, above the upper or spar-deck. "ACT NOT TO APPLY TO VESSELS NOT REQUIRED TO BE REGISTERED OR ENROLLED. Suc. 5. And be it further enacted, That the provisions of this act shall not be deemed to apply to any vessel not required by law to be registered or enrolled, or licensed, and all acts and parts of acts inconsistent with the provisions of this act are hereby repealed. Approved May 6, 1864. 17