Page:United States Statutes at Large Volume 47 Part 2.djvu/676

 Length of Fore-and- Alters. - 6'0" 8'0" 10' 0" - D ins. 6' 0" 5 8' G" 6 10' 0" 7 FORE-AND-AFTERS. Bulb Plate. Bulb Ante. Centre Fore-and-Afters. Side Fore-an - Afters. Mounting Spacing Centre to Centre. Spacing Centre to Centre. 3'0" 4'0" 5'0" 3'0" 4'0" 5' 0" ins. ins. ins. ins. ins. ins. ins. ins. ins. ins. ins. ins. ins. ins. ins. ins. ins. ins. 2~X 2~X .36 5X.34 5}2X .34 6X.36 5X3X.34 5~X3X.346X3X.36 2%X 2~X .38 6X.38 7X.40 7}lX.42 6X3X.38 7X3X.40 7~X3~X.42 2~X 2~X .40 7X.44 8X.46 9X.50 7X3X.44 8X3~X.46 9X3~iX.50 Wood Centre Fore-and-Afters. Wood Side Fore-and-Mters. Spacing Centre to Centre. Spacing Centre to Centre. I 3' 0" 4'0" 5'0" 3'0" 4'0" 5' 0" Iii' D B D B D B D B D B ins. ins. ins. ins. ins. ins. ins. ins. ins. ins. 5~ 7 6 7 5 5 5~ 5 6 5 6~ 7 7 7 6 5 6~ 6 7 6 7~ 7 8 7 7 6 7~ 7 8I 7 A=Plain angle. BP=Bulb plate. P=Plate. D=Depth. B=Breadth. r i Depths for hatchway beams are at the middle of the length and are measured from the top mounting to the lower edge. Depths for fore-and-afters are measured from the under side of the hatch covers to the lower edge. Sizes for intermediate lengths and spacing are obtained by interpolation. Where platt.s are specified, two angles, of the sizes given for mountings, are to be fitted at the upper and at the lower part of the beam. Where bulb plates are specified, two angles, of the size given for mountings, are to be fitted at the upper part of the beam or fore-and-after; Where bulb angles are specified, one angle, of the size given for mountings, is to be fitted at the upper part of the section. Where the specified flanges of an angle are of different dimensions, the larger flange is to be horizontal. • In ships not exceeding 100 feet in length, the depths of beams which 111'9 formed of plates and angles may be 60 per cent. of the depths given above; the depths of beams and steel fore-and-aeters formed of bulb angle or bulb plate section may be 80 per cent. of the depths given above; the thickness of plates, bulb angles and bulb plates should correspond to the thickness tabulated for the reduced depths with a minimum thickness of .30 inch; the depths and breadths of wood fore-and-afters may be 80 per cent. of those given In the tables for side f'lre-and-afters, but the centre fore-and-afters must be not less than 6~ inches wide. In ships between 100 feet and 200 feet in length, the sizes of the beams and fore-and-afters 111'9 to be detarmined by linee.r interpolation. [Footnote in the certified COpy.J ~ ~ ~ ~ ~t%j ~ Z > o z ~t"'1 o > to t"'1 ~ Z t%j a o z <: t%j z o ~ dt"'1 ~ .? I-' c:o ~