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40 THE MARINE. REVIEW LAKE SHIP YARD METHODS OF STEEL SHIP seh 4 girle The shell plating shown on the mid- ship plan is lettered from the strake next to the keel plating, the keel plat- ing being considered by itself and marked K is 42 ins. wide and. 37% pounds per square ft. A strake is 88" wide and 281% pounds per sq. ft. ° B strake is 88" wide and 25%4 pounds per sq. gt. C strake is 88" wide and 25% pounds | per sq. ft. D strake is 80" wide and 31 poutids per sq. ft. ' E strake is 78" wide and 31 pounds per sq. ft. F strake is 78" wide and 25%4 pounds per sq. ft. G strake is 78" wide aati 254, pounds per sq. fit. | étrake is 73" wide and 35 pounds per sq. ft. S_ Sheer strake is 80" mice and 40 pounds per sq. ft. The laps of Oe plating are shown on the midship section and seldom are changed amidships from this plan. The keel plating laps are 6'in. wide, the outer edge of A and strakes B, C. and. D have 5% in. laps E strakes 6 in, F and G 5%, H 6 in: and e Sheer Urals 10 inches wide. As well as the scantlings the location of the longitudinals are shown on the midship section and are definite. The measurements given for the hatch openings are 37 ft., being 18 ft. 6 in. on each side of the center. The hatch coamings are 26 in. nearer the ship side which makes the distances between hatch coamings 41 ft. 4 in. 'from side to side. The rise of'floor of this vessel is 4 in. and the camber of the tank top is 2 in., making the height of the tank top at side 5 ft. 4 in.. above the base line. The side line of the tank is governed by thé camber but the other lines run parallel with the sheer. The sheer at lowest point measure 30 ft. above the base line and the main deck is 10 ft. below sheer or 20 ft. above the base line at lowest point the main deck running parallel with the spar deck which is parallel with the sheer. The channel stringer fitted 4 ft. 9 in. below the spar deck runs par- allel with. same. _ The side stringers between the main deck and tank top run parallel with the tudinal Oe rots: CONSTRUCTION BY ROBERT CURR, miiees main deck at the height shown on midship section. run parallel with the center keelson at the distance shown on plan the girder E being in line with the inside of the tank at side, "The girders are in one' piece from the top of the floor plate and below the floor to the shell plating intercos- tals are fitted connecting the girders, floors and shell plating together. These girders run parallel with the center keelson and are scored out on top so that thé tank fop stiffeners pass through. Section showing lonsauediat seen on the midship section plan shows clearly the arrangement of the material for the girders which are composed of longi- continuous plate, continuous bottom angles, intercostal top angles to tank top and flanged intercostal plates connecting the girders. Channel floors and shell plating together. The vertical stiffening angles and clips for the intercostals are riveted to the channel floors and are considered with the frame of the ship. The intermediate stiffeners under the tank top spaced 18 in. apart are shown on the plan Fig. 1. These angles are connected to the girders with flanged bracket plates 16 pounds per square ft., every three feet. The angles coming on the frames are connected to the verti- cal stiffeners as shown on plan Fig. 1, the main frame. Connection of plate girder to arch is also shown on Fig. 1. The plate girder runs in line 'with the hatch openings and is intercostal between the arches. In way of the beams the girder plate is punched out so that the plate may fit close to the deck plating and be connected to the deck plating with an- gles fitted between the beams as shown by the sketch., This detail shows the' arrangement of material for the deck girder which is composed of plate the arches also the bottom angle and bracketed to the arches with 15 pound per square foot of flanged plate. The girder plate is connected to the deck and begins with angle clips as shown by sketch. Section showing side stringers illus- rates the make up of. the side string- ers in the side tank between the tank top and main deck and are composed of channels 12 in. x 25 pounds, 16 pound per,.sq. ft. flanged The girders are all fitted between -- yt se ONS intercostal plates and 16 pounds per sq. ft. brack- et plates at ends. by The channels are intercostal: hatiraen _the' web plates and connected to same with brackets as shown on detail. The' side stringer between the main and spar deck is composed of 15 in..x 33 pounds channel continuous and 16 pounds per square ft. ee intercos- tal. plate. Under the spar deck.t is fitted between the hatch opening and ship's side a continuous 12 ins x 25 ft. channel and intercostals of the same material as the beams connecting this girder, beams and deck together. The material shown by midship sec- tion and details Fig. 1, practically cov- ers the scantlings for this vessel and it would be hardly possible to success- fully design a vessel without this in- formation. It will be noticed that the materials are all: very much alike so that a standard is adopted of same on the lakes. A great number of plates and shapes can be ordered | alike which saves trouble and expense in sorting out and handling: a number of tinies. The MARINE REVIEW on May 2, writes. an article entitled "Not Yet. But Soon," which 'describes the advantages of the lake system of work which might be - applied to all the departments of lake ship building. Standardization is the object in all 'the departments of the lake built ship so that numerous pieces may be made from one mold or pattern. The economy of this may be realized when one considers the many plates -and shapes which may be put in place on the ship without shearing anything off same, leaving no scrap whatever from the material on the dead flat part of the ship. MATERIAL, All the plates and shapes to be af mild open hearth steel tested at the mill to the following specifications: Tensile strength to be not less' than 54,000: or more' than 64,000 pounds per square inch; limit of phosphorus. not to exceed 0.08; elongation to be not less than 24 perc cent in éight. in- ches; eduction to be not less than 45 per cent Reports of tests to be furnished with invoices and plates are not to run over e