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 require ments 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.

Propelling power debunkers having mov

ART. XIII. In ships that do not have fixed bunkers, but transverse duction for vessels with 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 ing fuel-oil compart 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

Propelling power de

fuel-oil compartments that can not be used to stow cargo or stores.

engines for propelling the ship, to the cubical contents of the space below the crown of the engine room; divide the sum by 100 or by 2.83, according as the measurements are taken in feet or meters, and the result shall be deemed to be the tonnage of the engine and boiler room and shall be the tonnage taken as the basis for calculating the deduction for propelling power.

If in any ship in which the space for propelling power is to be measured the engines and boilers are in separate compartments, the contents of each compartment shall be measured separately in like manner, according to the above method; and the sum of the tonnage of the spaces included in the several compartments shall be deemed to be the tonnage of the engine and boiler rooms, and shall be the tonnage taken as the basis for calculating the deduction for propelling power.

duction for vessels with ART. XIV. When vessels are fitted with fixed coal bunkers or with fuel-oil fixed bunkers, or having tanks or double-bottom fuel compartments which can not be used to stow cargo or stores, and when such bunkers, tanks, and fuel compartments have been certified by official marking to be spaces for the vessel's fuel, the deduction for propelling power may either be in accordance with the provisions of Article XIII above, or by deducting the actual tonnage of the spaces enumerated in Art. XII, Sec. 2 as measured in accordance with the following provisions, as the owner of the vessel may elect: Measure the mean length of the engine and boiler room, including the coal bunkers. Ascertain the area of three transverse sections of the ship (as set forth in the rules given in Articles VIII or IX for the calculation of the gross tonnage) to the deck which covers the engine. One of these three sections must pass through the middle of the aforesaid length, and the two others through the two extremities. Add to the sum of the two extreme sections four times the middle one, and multiply the sum thus obtained by the third of the distance between the sections. This product divided by 100 if the measurements are taken in English feet, or by 2.83 if they are taken in meters, gives the tonnage of the space measured. If the engines, boilers, and bunkers are in separate compartments, measure each compartment, as above set forth, and add together the results of the several measurements. The bunkers measured for fuel deduction shall include only those bunkers that are absolutely permanent, from which the coal can be trimmed directly into the engine room or stokehole, and into which access can be obtained only through the ordinary coal chutes on deck and from doors opening into the engine room or stokehole. Thwartship bunkers that can be in any way extended are not to be included in the measurements for deductions. When any portion of the engine or boiler rooms is occupied by a tank for fresh water, the space considered to be within the engine and boiler rooms shall be reduced by the space taken up by the tank for fresh water.

The contents of the shaft trunk shall be measured by ascertaining, and multiplying together, the mean length, breadth, and height. The product divided by 100, or 2.83, according as the measurements are taken in English feet or in meters, gives the tonnage of such space. 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.

The tonnage of the following spaces below the deck or covering of the first or lowest tier of side-to-side erections, if any, on the upper deck, as defined by Art. IV, section 3, is ascertained by the same method, viz: (a) The spaces framed in around the funnels. (b) The spaces required for the admission of light and air into the engine room. (c) The spaces, if any, necessary for the proper working of the engines. (d) Spaces occupied by the donkey engine and

boiler when used in connection with the main engines for propelling the ship and when situated within the boundary of the engine room or of the casing above the engine room. (e) Fuel-oil tanks and double-bottom compartments fitted for the stowage of fuel oil.

ART. XV. Under no circumstances shall any space which has not been included in the gross tonnage be deducted from gross tonnage.

No space may be deducted unless included in gross tonnage. Deducted spaces, if used, must be added to

The use of the whole or any portion of a deducted space, other than fuel spaces deducted under Article XIII, to stow cargo of any kind or stores other net tonnage. than boatswain's stores, or to provide passenger accommodations, shall be evidence that the entire space thus wholly or partially occupied is a part of the actual earning capacity of the ship, and the entire space shall be added to, and become a permanent part of, the net tonnage upon which Panama Canal tolls shall be collected.

measure vessels

and

ART. XVI. Only such officials as are authorized in the several foreign Officials that may countries and in the United States to measure vessels and to issue tonnage issue certificates. certificates for purposes of national fegistry, and such other officials as are authorized by the President of the United States, or by those acting for him, to measure vessels and to issue Panama Canal tonnage certificates, shall have authority to measure vessels for Panama navigation or to issue Panama tonnage certificates.

certificates

officials at the Panama

ART. XVII. Tonnage certificates presented at the Panama Canal shall be issued under these rules subject to correction by the official or officials authorized by the President of the may be corrected by United States, or by those acting for him, to administer these measurement Canal. rules, in so far as may be necessary to make the certificates conform to these rules.

ART. XVIII. The Panama Canal tonnage certificates issued by the measurement authorities of the United States and the several foreign countries shall correspond in substance and form to the sample certificate appended to these rules. Blank certificates in English will be furnished by the Secretary of War or the Governor of the Panama Canal upon request of the measurement authorities of foreign countries. The measurement authorities of any foreign country may also provide themselves with Panama Canal measurement certificates printed in English or in the language of the foreign country, provided such certificates strictly correspond in substance and form to the sample certificate appended to these rules.

RULES APPLYING TO VESSELS OF WAR, OTHER THAN ARMY AND NAVY TRANS-
PORTS, COLLIERS, SUPPLY SHIPS, AND HOSPITAL SHIPS.

Panama Canal tonnage certificates.

shall be levied upon upon arrival at canal.

ART. XIX. The toll on warships, other than Army and Navy transports, Tolls upon warships colliers, supply ships, and hospital ships, shall be based upon their tonnage of actual displacement actual displacement at the time of their application for passage through the canal. The displacement tonnage of such warships shall be their displacement before the vessels have taken on such coal, fuel oil, stores, or supplies as may be purchased and taken on board after arrival at the canal for transit through the same.

ART. XX. "Warships" in the meaning of Articles XIX to XXIV shall "Warships” defined. be considered to be all vessels of war, other than Army and Navy transports, colliers, hospital ships, and supply ships, as defined in Article I. Warships are vessels of Government ownership that are being employed by their owners for military or naval purposes.

draft, warships to

nated by governor of Panama Canal.

For determination of ART. XXI. Every warship, other than Army and Navy transports, anchor at station desig, colliers, supply ships, and hospital ships (as defined in Art. I) upon applying for passage through the Panama Canal shall, in order to facilitate the ascertainment of its mean draft, be anchored or placed at such station or location as shall be designated by the Governor of the Panama Canal or by the officials authorized to act for him.

Commander of each warship to exhibit ves

and curves.

ART. XXII. The commander of every warship, other than Army and Navy sel's displacement scale transports, colliers, supply ships, and hospital ships (as defined in Art. I), applying for passage through the Panama Canal shall exhibit for examination by the Governor of the Panama Canal or by the officials authorized to act for the Governor of the Panama Canal an official document containing the vessel's curve of displacement, its curves for addition to displacement for change of trim, and a scale so arranged that the displacement at any given mean draft is shown. Such document or documents shall be issued and be certified as correct by competent authorities of the Government to which the vessel belongs.

Actual displacement to be determined, and to

2,240 pounds.

ART. XXIII. The actual displacement of warships shall be determined be expressed in tons of from their official displacement scale and curves, and shall be expressed in tons of 2,240 pounds. Should the displacement scale and curves of a warship show or state the vessel's displacement tonnage in metric tons of 2,204.62 pounds, the tonnage so expressed shall be multiplied by 0.9842 for the purpose of converting the tonnage into tons of 2,240 pounds.

Rule for determining displacement of a war

displacement scale and

curves.

ART. XXIV. Should any warship, other than Army and Navy transports, ship not supplied with colliers, supply ships, and hospital ships (as defined in Article I) apply for passage through the Panama Canal and, for reasons satisfactory to the Governor of the Panama Canal, not have on board the duly certified document or documents specified in Article XXII, the Governor of the Panama Canal, or the officials authorized to act for him, shall then determine the displacement of the vessel, using such reliable data as may be available, or by taking such dimensions of the vessel and using such approximate methods as may be considered necessary and practicable. The displacement tonnage so determined shall be considered to be the displacement of the vessel.