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26 RULES FOR THE CONSTRUCFION OF STEEL VESSELS. POOPS AND RAISED QUARTER DECKS. SECTION 138. 1. For dimensions of beams for poops and raised quarter decks, see Table 6. For side plating, stringers, stringer angles and ties of these erections, see Table 11. The deck plating and planking are given in Table 9. 2. Where the engines and boilers are enclosed within the poop or raised quarter deck, the scantling arrangements may be dealt with in the same way as if they were on the upper deck, within the meaning of the rules; the beams, stringers, sheerstrakes, ties, etc., being of the size which would be required if the actual midship depth were increased by the height of the poop or quarter deck. 3. The bulkheads of poops or raised quarter decks should be as per Table 11. The bulkhead coaming plate should be supported vertically by channel bars, bulb or frame angles of the same weight required for main frames, spaced 30 inches apart, and properly secured by brackets above and below. 4. Horizontal brackets of the same thickness of the bulkhead coaming plate must be fitted to the bulkhead and bulwark plating about midway between the two decks. 5. Where a wood instead of a plated deck is fitted, the brackets to the bulkhead stiffeners must be connected top and bottom to transverse plates on the bulkhead beams, and the ends of these plates properly riveted to the stringers. Note.--When the dimensions of any vessel fall between those given in the Tables, the scantlings may be regulated by the lower number. rete eect 6. No reduction from the midship thickness of the upper deck sheerstrake will be allowed at the after end of vessels with poops or raised quarter decks, The side plating of the poop should extend two frames forward, and that of the raised forecastle two frames aft of their bulkheads, and the plates covering their breaks should be increased in thickness by 20 per cent. of their adjoining plates, 7. When the length of the raised forecastle or poop deck exceeds 25 per cent. of the vessel's length, the thickness of the upper deck sheerstrake should be increased by one-half, and the stringer plate by 20 per cent. for a length of some 20 feet at the breaks of both poop and forecastle, and when the combined length of the raised forecastle and poop or raised quarter deck exceeds 40 per cent. of the vessel's length, the upper deck sheerstrake should be increased 20 per cent. in thickness between the forward and after erections. 8. Cargo doors or openings of any description in the side of erections must be reinforced by suitable web and wrought iron frames to the suryeyor's satisfaction. 9. For particulars of riveting, see Sections 57 to 60. 10. Bulkhead plating of sunken windlass decks, dividing the cargo space from that in which the hawsepipes are fitted, should be of the same thick- ness as that required for the upper part of collision bulkheads, and stiffened vertically with angle bars of the weight required for second deck stringer angles, and spaced 30 inches apart on the after side, and if the height of the bulkhead exceeds 4 feet a horizontal stiffener is to be fitted on the forward side and equal in section to that of the main frame angle given in Table 3. 11. All openings for the purpose of admitting light, situated below the level of the upper deck, shall be fitted with substantial metal deadlights secured with screw bolts satisfactory to the surveyor.