386 PROCLAMATIONS, 1937 it for vessels with screw propellers 75 percent and for vessels with paddle wheels 50 percent of such space. Engine rooms, space 65. By the space occupied by the engine rooms is to be understood defed 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 the shaft trunks in vessels with screw propellers, the spaces which enclose 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 Ant, p . 373. deck (as defined in article III) 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 enclosed 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 the storage of fuel oil, lubricating 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, lubricating oil, or fresh water. Note that fuel-oil settling tanks are not to be in- cluded in the propelling-power space, no matter where situated. Store- rooms, dynamos, ice machine, etc., situated in the confines of the engine room and not bulkheaded off, may be included in engine-room space. If bulkheaded off, they shall not be included in engine-room space Ante, p. 382 but be given separate deductions when they qualify under article X and then listed under item 5 on page 2 of the Panama Canal Certificate. Ascertainment of 66. The cubical contents of the above-named spaces occupied by cubical contents of es occupied by the engine room shall be ascertained in the following manner: Measure enine room. 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 con- tents 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 machinery, for enclosing 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, Ate, p. 373. on the upper deck, as defined in article III. 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 machinery 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 measure- ments 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.
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