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August, 1909 THE Marine REvIEw Lake Shipyard Methods of Steel Ship Construction By Rospert Curr, wo THE lakes weight is 2,000 lb. cases 2,240 Ib. ton..and the "oross tons." This is somewhat seeing that gross tons is the term applied. to the register tonnage. the ton In some constitute a term used is great confusing, and 75 tons of coal mensions are: Length over all; 605 ft; leneth Be- tween perpendiculars, 585 ft.; breadth molded, 60 ft.; depth molded, 32 ft.; depth at center, 33 ft.; depth of water bottom, 5 ft. 6 in.}: depth of water bottom at side, 21 ft.: width of water On board. Die 269 Fig. 54 shows three plans, viz.: Sheer, spar deck and tank side top. On sheer plan the length over all is shown 605 ft, also the length be- tween perpendiculars, 585 ft. The length over all is measured from the foreside of the stem to the after end of the spar deck on the center line of the ship. Length be- tween perpendiculars is the distance from the after side of the stem to the foreside of the stern post. The dotted line on the top plan (the sheer plan) shows the height at center. Long tons for 2,240 Ib. and_ short tons for the 2,000 Ib. value would be less liable to mix matters. Gross' tons on a ship is understood to mean the gross register tonnage which is a statutory measurement unit established by law, and is the internal cubical capacity of the vessel divided by 100. Fig. 53 shows one of the laigest vessels on the great lakes ready for Sea. The boilers are full of water Fics $2: Lottom ak ele. 7) 1 a eae forward, 4 ft 234 in.; draught aft, 8 ft. 7 in.; draught mean, 6 ft. 4% in. * light displacement, 5,860 tons; ore car- ried on 20° ft. draught, 2,240 lb. per ton, 12,380 tons; coal carried on 20-ft. draught, 2,000 Ib. per ton, 13,866 tons; wheat, 514,050 bu.; gross register ton- nage, 7,962; net register tonnage, 6,189. The describing of the above items will be better understood by reference to Figs. 54-65. full line below. is the molded The height. The tank side line takes the place of the main deck line and runs parallel to spar deck or molded height, being 11 ft. below same. On the sheer plan the tank top line is also shown 5 ft. 6 in. above the inside of keel plate. Tank side top plan, Fig. 54, shows both sides of the vessel, while the spar deck only shows the half plan.