PROCLAMATIONS, 1937 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." ADDITIONAL DEDUCTIONS FROM GROSS TONNAGE ALLOWED VESSELS PROPELLED BY ENGINES 57. SECTION 1. The spaces specified above in article X shall be deducted from the space ned included gross tonnage to ascertain net tonnage in the case of vessels propelled by engines as in the case of vessels not propelled by engines. 58. SEC. 2. The space occupied by the engines, boilers, coal bunkers, fuel oil tanks, including settling tanks, lubricating oil tanks, and 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 III, 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 casing above the engine room and when used in connection with the main machinery for pro- pelling the vessel, shall be deducted. When the shafts of screw pro- pellers pass through open spaces not inclosed within tunnels, the spaces allowed in lieu of the tunnels must be of reasonable dimensions suit- able 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. 59. Donkey-engine and boiler spaces, when deducted according to article XIV below, shall not be made a separate deduction. 60. 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. 61. 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 percent of the gross tonnage. 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. 62. 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. 63. SEC. 5 . This section was eliminated by recommendation of Special Committee on Panama Canal Tolls and Vessel Measurement Rules, 1936. PROPELLING POWER DEDUCTION FOR VESSELS WITH BUNKERS HAVING MOVABLE PARTITIONS, OR HAVING FUEL-OIL COMPARTMENTS THAT MAY BE USED TO STOW CARGO OR STORES Additional deduc- tions from gross ton. nage. Ante, p. 3S2 . Space occupied by engines, boilers, etc. Ante, p. 373 . Donkey-engine and boiler spaces. Post, p. 387. Framed-in spaces around funnels, etc. Ante, 1p.376. l'rop'llilng pow r. sp'ae le(1dulction re- stricti,:n. Provisions govern- ing propelling power deductions. Vessels with bunk- ers having movable partitions, etc. 64. ART . XIII . In ships that do not have fixed bunkers, but trans- dPropeiong pover verse bunkers with movable partitions, with or without lateral bunkers, and in ships with fuel tanks which may be used to stow cargo or stores, measure the space occupied by the engine rooms, and add to 23918°-38--25
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