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Isherwood System of Construction In Which the Author Discusses Lloyds Rules Which Meet Every Consideration it will be seen that they cover every part of a vessel, to the smallest clip and meet every consideration neces- sary in a well built ship. It effects Bi A careful study of Lloyd's rules considerable saving in time by adopt-. ing the rules when designing a vessel for the preliminary work is extensive before facts are arrived at and only the same results can be accomplished. The section herewith is similar to Fig. 1 but of the transverse system and the scantlings as per Lloyd's rules. This vessel has a half girth of 36 feet 9 inches width of waterbottom from ship side, at line of tank top 4 feet and height of tank side 5 feet HATCH COAMINGS 24" x 236" above tank line. This arrangement of tank will have the margin 5 feet above tank top at the side, instead of at the bilge, and as the distance between the tank top at side 'and deck is over 7 feet, a side stringer must be fitted, as shown. If the tank had run down at the bilge instead of up the depth between the tank top and deck would be 15 feet 9 inches, and would require two side stringers or a web 15 inches deep with one stringer of the same depth for a vessel of this size. In this vessel with a tank margin turned down there would be a space of 5 feet around the bilge making the girth from the tank margin 21. feet, ® By Robert Curr The frame spacing is 23.5 inches, mak- ing an area. between the frames of 41.125 square feet. Considering the case of the web and _ side stringer would leave practically an area of *This is the fifteenth of a series of articles on the Isherwood system of construction which began in the September, 1912, issue of THE Marine Review. The first article dealt with the general specifications of the steamer; the second with the sheer, half-breadth and body plans; the third explained the method of getting the sheer; the fourth dealt with the longitudinal and transverse framing; the fifth with offsets; the sixth with the shell plating ; the seventh with the shell plating expansion; the eighth with the arrangement of plates and angles forming the spar deck; the ninth with the transverses; the tenth with bulk head construction; the eleventh with the connection of longitudinal frames to the bulkheads and transverses; the twelfth showed the interior framing between the tank top and spar deck; the thirteenth showed the amount of work that can be put together in a Great Lakes ship yard in a few hours; the fourteenth. showed details of riveting in shifts of butts; the fif- teenth considered the subject of butt straps and laps. STRINGER PLATE 4g# . BALANCE OF DOK 'age **¢ STRINGER ANGLE 3.5% x 36" x 046° ae BEAMS ON EVERY FRAME 7" x 3® x 4g" 4" ] 3" x 036" ANGLES ONE ROW OF SOLID PILLARS 3.5" DIAMETER, SHEER STRAKE 41" x «50! = e FOR HALF LENGTH AMID= SHIPS. LENGTH BETWEEN PERPENDICULARS ee eccercceadI eed ; | : BREADTH COCO ee ree ere ceccccecescoeccecevee 40.00 . DEPTH SASS CSR eO C0 8 06 0,6.0 010, 4 68.6 670 6.6 s oo 0b a6 418.25 : | LONGITUDINAL NUMBER Coe e recov ececececnen 11,201 TRANSVERSE - 586265 \ PONTE SCR ee ee eae § STRINGER be 5" x Bean x - PROPORTIONS DEPTH T0 LENGTH eoscscccccee 10655 =e" camps i aie ) ( j FRAMES OF ANGLE 3° x 3° X~38" SPACED 2305" APART. | , a J STRAKE 41° x 946 FOR HALF LENGTH AMID= SHIPS TO #38" AT ENDS WEBS 16" x o36" 4 ANGLE QOELLULAR DOUBLE BOTTOM. 5" x 305" x 52 a BOTTOM BULB 7" , e44" ABOVE TANK. NOT TO EXCEED 24" IN PEAK. FLOORS ON EVERY FRAME 030" IN THICKNESS. CENTER GIRDER 33" x 440", SOP ANCLES 3" x 3% x 30", BOTTOM ANGLES 3.5" x 3.5" x 046" a Ll f I STRAKE «46 TO 038 AT Se +34" AT ENDS AND .50" UNDER BOILERS. VERTICAL ANGLES 3° x 3" x ,30° SIDE GIRDERS 30° AND 040 UNDER BOILERS. ANGLES TO FLOORS 2.6" x 2.5% x ,30" Te TANK TOP RIDER PLATE 33" x 938" , BALANCE OF TANK TOP .30* TANK MARGIN 16% x 0375" Po | ENGINE ROOM «34" UNDER BOILERS 46% 230" FLOORS, ABOVE FLOORS 26", ANGLES TO SHELL 4" x 4" x .4e SINGLE VERTICAL ANGLES 464° x 3% x 440" SPACED 24" APART. BRACKETED TO TANK & DEOK. DECK ANGLES DOUBLE 3" x 3® x ,30® BULKHEADS H STRAKE .46" to 36" AT ENDS. 3 xz 3" x 230" BS sees Serer 1 eee ae Vesey G STRAKE 246" TO a +38" AT ENDS. 230 / «30" | _--_-- 4 3F X_23R® tag pereeemnnnet se rf eee & STRAKE «46 TO Se (RAKE 246" 7 ENDS --= ' " D STRAKE. «46 058 A 5 SERRE tne 9 STRAT yn ENDS. £0 «36° AT ENDS. TO 38" A . e