in consideration of the increase of height of deck in the "well." (f) In flush-deck vessels and in vessels having short poops and forecastles the excess of sheer for which an allowance is made shall not exceed one-half the total standard mean sheer for the size of the ship. (g) No decrease should be made in the freeboard of spar and awning deck vessels, in respect of excess of sheer. 17. Round of beam.-In calculating the reserve of buoyancy, an allowance has been made of one quarter of an inch for every foot of the length of the midship beam for the round up. When the round of the beam in flush-decked vessels is greater or less than that given by this rule, divide the difference in inches by 2, and diminish or increase the freeboard by this amount. For vessels with erections on deck the amount of the allowance should depend on the extent of the main deck uncovered. This rule for round of beam does not apply to spar or awning deck vessels. 18. As a general illustration of the way in which the Tables should be used in modifying the freeboard on account of erections on deck, extreme proportions and variations in sheer, the following may be taken as an example: A vessel is 234ft long, 29ft broad, and has a moulded depth of 17 oft, the coefficient of fineness being ·72. Suppose the vessel to have a poop and bridge-house of the united length of 121ft, and a forecastle 20ft in length, and let the sheer forward, measured at the side, be 4ft 6in, and aft 2ft rin. Freeboard by Tables A if of the normal length, without erections, and with the normal amount of sheer..... The mean sheer by rule is 33'4in, or 6in less than that in the vessel, Freeboard of vessel without erections and with 394in mean sheer Ft. in. 2 II 2 I Amount deducted from freeboard for excess of sheer. I 2 12 The length being 30ft in excess of that for which the tables are framed, the addition to the freeboard in respect of the same is one-half of 30-20ths of 2in, or .... That is 10in to be deducted from 2ft 11in, leaving a winter freeboard of 2ft olin. Corresponding summer freeboard 1ft 10in. [Paragraph 19 will be found on p. 140, following Tables.] TABLE A.-CARGO-CARRYING STEAM VESSELS NOT HAVING SPAR OR AWNING DECKS. For allowances admitted in vessels having erections on deck, see "Explanation." The reduction in freeboard for summer voyages from European and Mediterranean Ports is to be made from April to September inclusive. In other parts of the world the reduced freeboard should be used during the corresponding or recognised summer months. The additional freeboard specified for the North Atlantic trades is to apply to vessels sailing to or from the Mediterranean or any British or European Port, and which may sail to or from, or call at Ports in British North America or Eastern Ports in the United States, north of and including Baltimore, from October to March, inclusive. Double the reduction to be allowed for voyages in the fine season in the Indian seas, between the limits of Suez and Singapore. Coefficient of Fineness. 22'0 Table of Reserve Buoyancy and Freeboard for First-class Sea-going Iron and Steel Steam Vessels (in Salt Water). Percentage Reserve Buoyancy-(Winter). 22'2 22'4 22.6 22'8 23'0 23°2 23°4 23'6 23.8 24'0 24°2 24'5 2471 25'0 25'2 25'5 25'7 25'0 26'2 Corresponding Height of Freeboard Amidships (Winter), Measured from Top of Deck at Side. 26'5 Moulded Depth and Length. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. ΙΟ O 10 6 II O II 6 12 O 12 613 0 13 6 14 in. ft. in. ft. in. ft. in. ft. O 14 6 15 O 15 6 16 ft. ft. ft. ft. ft. ft. ft. ft. ft. ft. ft. ft. ft. 126 132 138 144 150 156 162 168 174 180 186 192 ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. in. ft. 6 1 7 1 8 I I II 2 O 2 1 2 3 2 4 2 5 2 7 2 8 2 10 I 6 I 72 I 8 1 11 2 of 2 14 2 3 244 2 6 2 I 8 I 9 64 1 8 I 9 71 in. ft. in. ft. in. ft. in. ft. in. ft. 0 16 6 17 017 6 18 0 18 ft. ft. 198 204 ft. ft. ft. ft. ft. ft. 210 216 222 228 234 240 2 I 2 I 22 2 2 2 1} 2 3 2 32 5 264 2 8 2 9 2 11 304 3 2 3 34 3 6 7 84 1 I II 2 of 2 2 3 2 2 6 2 73 2 2 8 9 2 11 3 0 3 2 3 4 3 5 3 7 2 9 2 113 I 3 2 3 4 3 6 9 I 10 I II 2 I 2 21 2 4 2 532 7 2 8 2 10 3 O 3 1 3 3 3 5 5 3 7 64 3 8 7 3 84 8 3 94 3 8 3 10 3 9 3 11 3 8 3 10 3 114 3 64 383 10 4 O 3 3 3 3 A. Correction in inches for a change of 10 ft. in the length. Coefficient of Fineness. Corresponding Height of Freeboard Amidships (Winter), Measured from Top of Deck at Side. 6 22 6 24 0 24 6 25 in. ft. 25 6 26 in. ft. in. ft ft. ft. ft. ft. ft. 276 282 288 ft. ft. ft. 306 294 300 312 0 26 6 27 in. ft. in. ft. 0 27 6 28 ft. ft. ft. ft. ft. ft. ft. ft. 324 330 336 342 348 354 360 366 Corre ion in inches for a change of 10 ft. in the length. Coefficient of Fineness. Corresponding Height of Freeboard Amidships (Winter), A. Correction in inches for a change of 10 ft in the length.. C. Addition in inches for winter, North Atlantic. 19. Vessels loaded in fresh water may have less freeboard than that given in the several tables Moulded Depth in Feet. according to the following scale : Reduction in Freeboard. Spar and Without Erections Awning-Deck on Deck. in. Vessels. in. 24 34 61 MEMO. The weight of a cubic foot of salt water is taken in the above table to be 65 lb., and that of fresh water 62.5 lb. For weight of waters see p. 20. TABLE B.-CARGO-CARRYING SPAR-DECK VESSELS. These Tables apply to spar-deck vessels in which the height at side between the main and spar decks is 7 ft, from top of beam to top of beam; when this height is greater or less than 7ft., the freeboard to the spar deck will require modification. Table of Freeboard to Spar Deck for First-class Sea-going Spar-deck Steam Vessels (in Salt Water). Height of Freeboard Amidships (Winter), Measured from Top of Spar Deck at Side. A. Correction in inches for a change of 10 ft. in the length. B. Deduction in inches for summer voyages C. Addition in inches for winter North Atlantic. |