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RRM Tee em TE ean SORE ee ee os oe eae RES PT SR A RR REN NN Ba EEE ice Dee RS iy OE a EL Ce oS ee nr Mh NIRS ee OT a aL RES: Se GAN i eee a re ee ee Roose & . # THOMPSON'S COAST -PILOT. 309 express her length and breadth, together with her depth, and the height under the third or spar deck, which shall be ascertained in the following manner: The tonnage-deck, in vessels having three or more decks to the hull, shall be the second deck from below; in all other cases, the upper deck of the hull is to be the tonnage deck. The length from the forepart of the outer planking, on the side of the stem, to the after part of the main stern-post of screw steamers, and to the after part of the rudder-post of all other vessels measured on the top of the tonnage-deck, shall be accounted the vessel's length. The breadth of the broadest part on the outside of the vessel shall be accounted the vessel's breadth of beam. A measure from the under side of tonnage-deck plank, amidships, to the ceiling of the hold (average thick- ness) shall be accounted the depth of hold. If the vessel has a third deck, _ then the height from the top of the tonnage-deck plank to the under side of the upper-deck plank shall be accounted as the height under the spar- deck. All measurement to be taken in feet and fractions of feet; and all fractions of feet shall be expressed in decimals. TONNAGE OF VESSEL DERIVED FROM CUBIC CONTENT. Sec. 3. And be it further enacted, That the register tonnage of a vessel shall be her entire internal cubical capacity in tons of one hundred cubi¢ feet each, to be ascertained as follows: LENGTH HOW TAKEN AND NUMBER OF DIVISIONS. Lengths.--Measure the length of the vessel in a straight line along the upper side of the tonnage-deck, from the inside of the inner plank, (average thickness,) at the side of the stem to the inside of the plank on the stern timbers, (average thickness,) deducting from this length what is due to the rake of the bow in the thickness of the deck, and what is due to the rake of the stern-timber in the thickness of the deck, and also what is due to the _ rake of the stern-timber in one-third of the round of the beam; divide the length so taken into the number of equal parts required by the following table accerding to the class in such table to which the vessel belongs : TABLE OF CLASSES. "Crass 1. Vessels of which the tonnage length, according to the above measurement, is fifty feet or under, into six equal parts. Crass 2. Vessels of which the tonnage length, according to the above measurement,gs above fifty feet, and not exceeding one hundred feet long, into eight equal parts. Cuass 8. Vessels of which the tonnage length, according to the above | measurement, is above one hundred feet long, and not exceeding one hundred and fifty feet long, into ten equal parts. Cuass 4. Vessels of which the tonnage length, according to the above | measurement, is above one hundred and fifty feet, and not ex- ceeding two hundred feet long, into twelve equal parts. Crass 5, Vessels of which the tonnage length, according to the above