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LAKE SHIP YARD METHODS OF STEEL SHIP CONSTRUC- TION. BY ROBERT CURR. BULKHEADS. Fig. 3 shows bulkhead with a belt frame. 'The bulkhead plating: is 12.5 Teg. sttfthers 6°: x 344 im, x ¥5 Tbs. chaniels and all other angles 372 x 3% x 8% Ibs. The half bulkhead plan is laid down ofi the mold loft floor and molds are made for each plate, one mold each for horizontal and vertical 'stiffeners. Two plates are marked from each mold for each bulkhead and all the stiffeners from one mold for the ver- tical and one for the horizontal chan- nels. The frame mold is used for both sides as well as other angles shown on plan. Fig. 4 shows watertight division of tank. The plating is 15 lbs., frame an- gles 5 in. x 5 in. x 16.2 Tbs. and other angles 314x3%4x8.5 lbs. Molds are made similarly to the belt frame, also for the frames for the blacksmith work which are made and one-half. of same riveted on to the floor before the frame is erected, the remainder of the watertight frames are put in as soon as the girders are erected. All the work around the watertight floors being carefully riveted and caulked before the same is cov- ered in. . A mold is made for every piece on the bulkhead so that nothing is tem- plated after the work is erected in place. ~ In Scotland the tank divisions Fig. 4 would be laid down on the Scrieve board, the plating and. frame angle of same marked, punched and put to- gether. All the other work being done when the longitudinals are in place and riveted. Fig. 3, the bulkhead would be built in the vessel after the tank top and tank side are in place. The angle connecting the bulkhead -- to the tank top and tank side would be put on and a template made on the ship to the shape of the bulkhead. The plates would be laid out flat any- where under cover and marked to the shape from the template obtained from the vessel. The rivet holes for the laps, chan- nels, etc., would be marked from tem- plates drilled for that purpose, so that. when the bulkhead has been laid out all the parts. are. punched and erected in place on the vessel. is done after the different parts are © 'in place and riveted together. The bulkhead work watertight -parts completed . in place including the TAE Marine REVIEW ready for riveting would cost in Scot- land one hundred and forty dollars for each bulkhead. On the lakes with the mold system the cost would be five per cent less. FRAME BEVELING. There is the same practice nearly everywhere in frame bending and -bey- ---WATER TIGHT BULKHEADSIN TANK-:" "BALLAST PIPES SEE TANK TOP PLAN- | Pig « EF [ FRLXBRKB, ye OO OO: 25 The lifting of the bevels for the fur- -naceman, or frame bender, is different here than anywhere else and is very simple and useful for the style' of con- struction. Fig. 5 shows a mold made for the frame bender with the bevels. marked On;'viz.; 24,:24, 20, 16, 12, 8' and 4. +The ee ' BAX Bie DBL if Y heb "i622 co Dik BULKHEADS NO. 68-116 LOOKING FORWARD. HORLZON TAL ert S NES VERTICAL | PLATING: 12.57 & 15" VERTICAL SILPE NES: 6"XB%X 15" CHNNELS. LUGGED TO TAI. Sa eee 6 oe eee eee eee LAD. then, t Be X3%e DBLE. NGLE Bi5" SINGLE 1: FL. P78 + 6-10%-- | WATER a WITIGHT DOOR. 9 2 ! qj 5 2 === Fare ae = F All smith work...' eling. Some use machines, others do the work by manual labor. In every case care is taken to have the flange next the plating smooth. a : BAX Bex RD = siexonx numbers represent quarte:s of an inch, the space between the frame lines on the floor or the difference in width of the frame farthest from midships.