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the stem and the breadth at the stern; number them successively 1, 2, 3, etc., commencing at the stem; multiply the second and all the other even-numbered breadths by 4, and the third and all the other odd-numbered breadths (except the first and last) by 2; 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 the space; measure the mean height of the space, and multiply by it the mean horizontal area, and the product will be the cubical contents of the space; divide this product by 100 (or by 2.83 if the measurements are taken in meters) and the quotient shall be deemed to be the tonnage of the space, and shall be added to the tonnage of the ship ascertained as aforesaid; and if the ship 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 ship ascertained as aforesaid.

SEC. 5. If there be a break, a poop, or any other permanently covered or closed-in space on or above the upper deck (as defined above in Article III) the tonnage of such space shall be ascertained as follows: Measure the internal mean length of the space in feet, and divide it into two equal parts; measure at the middle of its height three inside breadths, namely, one at each end and the other at the middle of the length; then to the sum of the end breadths add four times the middle breadth, and multiply the whole sum by one-third of the common interval between the breadths; the product will give the mean horizontal area of the space; then measure the mean height and multiply by it the mean horizontal area; divide the product by 100 (or by 2.83 if the measurements are taken in meters) and the quotient shall be deemed to be the tonnage of the space.

SEC. 6. In measuring the length, breadth, and height of the general volume of the ship or that of the other spaces, reduce to the mean thickness the parts of the ceiling which exceed the mean thickness. When the ceiling is absent, or when it is not permanently fixed, the length and breadth shall be reckoned from the main frames of the ship, not from the web or belt frames. The same principle is to hold in the case of deck erections, that is, the breadth is to be reckoned from the main framing or stiffeners of the same, when ceiling is not fitted. When the main framing of the ship is curved or carried upward and inboard so as to permit the building of topside tanks or compartments outboard of the main framing, the breadth of the ship shall be reckoned from the outboard framing of such outboard tanks, thus including these tanks in the measurement.

RULE II.-For measuring the gross tonnage of laden ships.

SEC. 7. When ships have cargo on board, or when for any other reason their tonnage can not be ascertained by means of Rule I, proceed in the following manner:

Measure the length on the uppermost full-length deck from the outside of the outer plank at the stem to the aft side of the sternpost, deducting therefrom the distance between the aft side of the sternpost and the rabbet of the sternpost at the point where the counterplank crosses it. Measure also the greatest breadth of the ship to the outside of the outer planking or wales at the middle perpendicular. Then, having first marked on the outside of the ship on both sides thereof the height of the uppermost full-length deck at the ship's sides, girt the ship at the middle perpendicular in a direction perpendicular to the keel from the height so marked on the outside of the ship, on the one side, to the height so marked on the other side, by passing a chain under

Rule for the measurement of laden vessels.

Rule for the measurement of open vessels.

Definition of stores and cargo carried Army and Navy trans

ships.

on

the keel; to half the girth thus taken add half the main breadth; square the sum, multiply the result by the length of the ship taken as aforesaid, then multiply this product by the factor 0.17 in the case of ships built of wood, and by the factor 0.18 in the case of ships built of iron or steel. The product will give approximately the cubical contents of the ship, and the tonnage can be ascertained by dividing by 100 or by 2.83, according as the measurements are taken in English feet or in meters.

SEC. 8. If there be a break, a poop, or other permanently covered and closedin spaces (as defined above in Article III) on or above the uppermost fulllength deck, the tonnage of such spaces shall be ascertained by multiplying together the mean inside length, breadth, and depth of such spaces and dividing the product by 100, or 2.83, according as the measurements are taken in English feet or meters, and the quotient so obtained shall be deemed to be the tonnage of the spaces, and shall be added to the other tonnage in order to determine the gross tonnage or total capacity of the ship.

RULE III.-For measurement of open vessels.

SEC. 9. In ascertaining the tonnage of open ships, the upper edge of the upper strake of the shell plating is to form the boundary line of measurement, and the depths shall be taken from an athwartship line, extended from upper edge to upper edge of the said strake at each division of the length.

DEDUCTIONS FROM THE GROSS TONNAGE TO ASCERTAIN THE NET TONNAGE. (A) DEDUCTIONS FOR VESSELS NOT PROPELLED BY ENGINES.

ART. X. The following spaces (enumerated below in secs. 1 to 10 of this article) shall be deducted from the gross tonnage in order to ascertain the net tonnage of vessels not propelled by engines, and no other spaces shall be deducted. Unless otherwise expressly stipulated, these spaces shall be deducted whether located above or below the upper deck.

The volume or cubical contents of deducted spaces shall be ascertained in the manner specified in Article VIII or Article IX of these rules. The remainder, resulting from deducting from the total space included in gross tonnage the sum of the cubical contents of the spaces whose deduction from gross tonnage is permitted by these rules, shall be the net or register tonnage of vessels not propelled by engines and unrigged craft upon which tolls and other charges based upon tonnage shall be paid by vessels of commerce, Army and Navy transports, colliers, supply ships, and hospital ships (as defined in Art. I) for passage through the Panama Canal. One hundred cubic feet, or 2.83 cubic meters, shall constitute one gross or net ton.

Spaces for the use, or possible use, of passengers (as defined in Art. VI) shall not be deducted from the gross tonnage, except in so far as their deduction may be specifically provided for in the following sections (1 to 10) of this article of these rules.

Spaces available for the stowage of stores (other than boatswain's stores) or ports, colliers, supply cargo shall not be deducted from gross tonnage. In case of Army and Navy ships, and hospital transports, colliers, supply ships, and hospital ships, as defined in Article I, the term "stores (other than boatswain's stores) or cargo" shall include, in addition to goods or cargo ordinarily carried as freight on vessels of commerce, the following articles:

On transports, food, stores, luggage, accouterments, and equipment for passengers.

On colliers, coal, coaling gear, and fuel oil not for the use of the colliers.

On supply ships, stores, supplies of all kinds, distilling machinery and distilled water (other than feed water stored in double-bottom compartments), machines, tools and material for repair work, mines and mining material, torpedoes, arms, and ammunition.

On hospital ships, food stores for pasengers, medical stores, and hospital equipment.

Guns mounted on transports and supply ships, for defense of the ships, and ammunition required for use in such guns shall not be classed as cargo.

Deductions from gross

SECTION 1. The tonnage of the spaces or compartments occupied by, or tonnage allowed vessels appropriated to the use of, the officers and crew of the vessel shall be deducted. not propelled by enThe term "officers and crew" shall include the personnel inscribed on the ship's rolls, i. e., the ship's officers, engineers, doctors, apothecary, sick attendants, sailors, apprentices, firemen, mechanics, and wireless operators; but shall not include clerks, pursers, stewards, and other members of the personnel provided by the ship for the care of the passengers. The spaces or compartments occupied by the officers and crew shall include their berthing accommodations, spaces provided for medical attention, mess rooms, ward and dressing rooms, bath and wash rooms, water-closets, latrines, lavatories, or privies for their exclusive use, and passageways exclusively serving these spaces.

SEC. 2. On hospital ships the spaces or compartments occupied by doctors, apothecary, and sick attendants duly inscribed on the ship's rolls, shall form part of the deduction under section 1 of this article. Spaces provided for the medical attention of the officers and crew of a hospital ship shall likewise be deducted; but spaces fitted for the transportation, or for the medical attention, of other persons than those duly listed in the ship's rolls shall not be deducted. SEC. 3. The space occupied by the master's cabin shall be deducted. SEC. 4. Cook houses, galleys, bakeries, laundries, and rooms for ice machines, when used exclusively to serve the officers and crew, and the condenser space, and distilling rooms, when used exclusively for condensing and distilling the water for the officers and crew, shall be deducted.

SEC. 5. Spaces used for the anchor gear, steering gear, and capstan; the wheel house, the dynamo rooms; the chart room used exclusively for keeping charts, signals, and other instruments of navigation; lookout houses; spaces for keeping electric searchlights and wireless telegraph appliances; and other spaces actually used in the navigation of the ship, shall be deducted. Such spaces upon vessels of commerce as may be devoted to the mounting of guns and to the stowage of ammunition for the guns thus mounted shall be deducted. The deduction of all spaces, other than those devoted to the mounting of guns, enumerated in this section must be reasonable in extent and be subject to the limitations stipulated below in Article XI.

SEC. 6. In case of a ship propelled wholly by sails, any space, not exceeding 21 per cent of the gross tonnage, used exclusively for storage of sails shall be deducted.

SEC. 7. Spaces used exclusively for boatswain's stores shall be deducted. The deduction is not, however, to exceed 1 per cent of the gross tonnage in ships of 1,000 tons gross and upwards, nor more than 75 tons in any ship however large. In vessels from 500 to 1,000 tons gross the limit is fixed at 10 tons and in vessels from 150 to 500 tons at not more than 2 per cent of the gross tonnage. In vessels under 150 tons at not more than 3 tons.

SEC. 8. The space occupied by donkey engine and boiler shall be deducted if the donkey engine and boiler are connected with the main pumps of the ship, or if they are located in a permanently covered or closed-in structure on or above the upper deck.

SEC. 9. Passages and passageways shall be deducted if they serve deducted spaces exclusively for the officers and crew.

The marking and use of exempted spaces

SEC. 10. Water-ballast spaces, other than spaces in the vessel's double bottom, shall be deducted if they are adapted only for water ballast, have only ordinary manholes for access and are not available for the carriage of cargo, stores, or fuel. If used to carry oil or other fuel, these spaces shall be regarded as part of the vessel's fuel space and shall not be subject to separate deduction. ART. XI. Each of the spaces enumerated in Article X, sections 1 to 10, unless shall be according to otherwise specifically stated, shall be subject to such conditions and requirements as to marking or designation and use or purpose as are contained in the navigation or registry laws of the several countries, but no space, other than fuel spaces deducted under Article XIII of these rules, shall be deducted unless the use to which it is to be exclusively devoted has been appropriately designated by official marking. In no case, however, shall an arbitrary maximum limit be fixed to the aggregate deduction made under Article X.

national laws.

Deductions from gross tonnage allowed vessels

(B) DEDUCTIONS FOR VESSELS PROPELLED BY ENGINES.

ART. XII. The net or register tonnage upon which tolls and other charges based upon tonnage shall be paid by vessels of commerce, Army and Navy transports, colliers, supply ships, and hospital ships, as defined in Article I, propelled by engines, for passage through the Panama Canal, shall be the tonnage remaining after the following deductions have been made from the gross tonnage. One hundred cubic feet, or 2.83 cubic meters, shall constitute 1 gross or net ton. Vessels propelled partly by sails and partly by engines shall be classed as "vessels propelled by engines:"

SECTION 1. The spaces specified above in Article X shall be deducted from propelled by engines. the space included in gross tonnage to ascertain net tonnage in the case of vessels propelled by engines as in the case of vessels not propelled by engines. SEC. 2. The space occupied by the engines, boilers, coal bunkers, fuel-oil tanks, double-bottom fuel and feed-water compartments, shaft trunks of vessels with screw propellers, spaces, within a closed-in side-to-side erection, that are framed in around the funnels or that are required for the introduction of light and air to the engine room to the extent that the framed-in spaces around the funnels and the light and air casings are located below the deck or covering of the first or lowest tier of such erections, if any, on the upper deck, as defined in Article IV, section 3, and are contained in closed-in side-to-side erections, spaces necessary for the proper working of the engines, and spaces occupied by the donkey engine and boiler when situated within the boundary of the engine room or within the light and air casings above the engine room and when used in connection with the main machinery for propelling the vessel. When the shafts of screw propellers pass through open spaces not inclosed within tunnels, the spaces allowed in lieu of the tunnels must be of reasonable dimensions suitable for the vessel in question. When any portion of the engine or boiler rooms is occupied by a tank for fresh water, the space thus taken up shall not be deducted.

Donkey-engine and boiler spaces, when deducted according to Article XIV below, shall not be made a separate deduction.

The portion of the framed-in spaces around the funnels and of the light and air casings that extend above the deck or covering of the first or lowest tier of side-to-side erections, if any, on the upper deck, as defined in Article IV, section 3, and surrounding the said space or spaces are exempted from measurement and form no part of the space deducted under this section.

SEC. 3. The deductions made for propelling power, including all those provided for in section 2 of this article, shall in no case exceed 50 per cent of the gross tonnage, except in case of tugs employed exclusively as tugs. In

other respects the spaces enumerated in section 2 shall, except as otherwise specifically stated, be subject to the requirements as to designation or marking and use or purpose contained in the navigation or registry laws of the several countries.

SEC. 4. The deductions made for propelling power provided for in section 2 of this article shall be made according to the provisions of Article XIII or of Article XIV, as the owner of the vessel may elect.

SEC. 5. Double-bottom compartments that are set aside to be used exclusively for the stowage of feed water for the ship's boilers shall be deducted.

duction vessels with bunkers having mov

ART. XIII. In ships that do not have fixed bunkers, but transverse Propelling power de bunkers with movable partitions, with or without lateral bunkers, and in ships able partitions, or havwith fuel tanks or double-bottom fuel compartments which may be used to ments that may be used stow cargo or stores, measure the space occupied by the engine rooms, and add to stow cargo or stores. to it for vessels with screw propellers 75 per cent and for vessels with paddle wheels 50 per cent of such space.

By the space occupied by the engine rooms is to be understood that occupied by the engine room itself and the boiler room, together with the spaces strictly required for the working of the engines and boilers, with the addition of the spaces taken up by shaft trunks (in vessels with screw propellers), the spaces which inclose the funnels and the casings necessary for the admission of light and air into the engine room to the extent that such spaces are located below the upper deck or below a deck with openings (usually designated as tonnage openings) which may be so closed as to permit the carriage of cargo or stores under the deck or a portion thereof, and donkey-engine and boiler spaces when the donkey engine and boiler are situated within the boundary of the main engine room or of the light and air casing above it and when they are used in connection with the main machinery for propelling the vessel. When the shafts of screw propellers pass through open spaces not inclosed within tunnels, the spaces allowed in lieu of tunnels must be of reasonable dimensions suitable for the vessel in question. When a portion of the space within the boundary of the engine or boiler rooms is occupied by a tank or tanks for fuel oil or fresh water, the space considered to be within the engine room shall be reduced by the space taken up by the tank or tanks for fuel oil or fresh water.

The cubical contents of the above-named spaces occupied by the engine room shall be ascertained in the following manner: Measure the mean depth of the space occupied by the engines and boilers from its crown to the ceiling at the limber strake; measure also three, or, if necessary, more than three, breadths of the space at the middle of its depth, taking one of such measurements at each end and another at the middle of the length; take the mean of such breadths; measure also the mean length of the space between the foremost and aftermost bulkheads or limits of its length, excluding such parts, if any, as are not actually occupied by or required for the proper working of the engines and boilers. Multiply together these three dimensions of length, breadth, and depth, and the product will be the cubical contents of the space below the crown. Then, by multiplying together the length, breadth, and depth, find the cubical contents of the space or spaces, if any, which are framed in for the machinery, for inclosing the funnels, or for the admission of light and air, and which are located between the crown of the engine room and the uppermost deck or covering of the first or lowest tier of side-to-side erections, if any, on the upper deck, as defined in Art. IV, section 3. Add such contents, as well as those of the space occupied by the shaft trunk and by any donkey engine and boiler located within the boundary of the engine room or of the light and air casing above the engine room and used in connection with the main

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