PROCLAMATIONS, 1937 67. 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. PROPELLING POWER DEDUCTION FOR VESSELS WITH FIXED BUNKERS, OR HAVING FUEL-OIL COMPARTMENTS THAT CANNOT BE USED TO STOW CARGO OR STORES 68. ART . XIV . When vessels are fitted with fixed coal bunkers or with fuel-oil tanks which cannot 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 article XII, section 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 calcula- tion 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 mul- tiply 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 ton- nage 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 stoke-hole, and into which access can be obtainedl only thlrough the ordinary coal chutes on deck and from doors opelingl into the engine room or stokehole. Thwartship bunkers that can be in any waiy extended are not to he inclu(lded in the measure- nments for deductions. Wh1en anyy portion of the engine or boiler rooms is occupied by storage tanks for fresh water, the space considered to be within the engine and boiler rooms shall be reduced by the spaces taken up by the tanks for fresh water. 69. The contents of the shaft trunk shall be measured by ascertain- ing, 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 enclosed within tunnels, the spaces allowed in lieu of tunnels must be of reasonable dimensions suitable for the vessel in question. 70. 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 article III, 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. 387 Where engines and boilers are in separate compartments. Vessels with fixed bunkers, etc. Propelling power deduction. Ante, p. 385. Ante, p. 385. Ante, p. 378. Contents of shaft trunk, measurement. Spaces below deck, etc.
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