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ee ee Te PE ee oe ee TRAE Marine Review i 530.0, Nol eo; Th 0.1 Oo 10 F [0% 0% dio 0% 0 0°o 0% G5 0% 0° 0° aP'0 00 0°0 oO DIAll! | Poo 00%! do 950% CoG S oo} F 49 10 "0; 1919, 10fo001DD O}o, (0, | \! 1 ! x { rel loooj}000 \ ! ' Ig . is 19 ICIS 'Pboo,000/% 1 9 4 ' Nig! bo iol! | 'O}O 00,00 Oo) Ng dl 1 ies ! (| | looooo| | ! \ {1 nt 4 i \loo0j000/°! 4 i. Yo 1 19 te! 1 4° 9 Wt 1 i; 1M, 1 97 oe!o00 oO} 4! Ny ee NO IOs = at. See Alo, JCCo!ooo| | 1 __ ares Hoy a= 9 0 OTe S95 Tol (O50 5 "oO S85 SG Wig 'log OOO /SBI 1S. 6 B= SAT ° eee 7 eo oo Sei co ee Ot 8 6 eo ee © cb ih i dig 000 mo | | ° { ° Choo gaa ods oboe o 6b HeGe 6 hime doeuina 5 o5 bake 0-0 © Old '!00 016 0 oO! Igo 0 0 0 0 44O 0 6 O71 a0 0 Oo 8- 18 00-0 6m O56 ere ee) 66) 16 © © §1\o 6 So gic o 6 Ot 8 C6 On 29a a0 )0I0 o 0,0 cn 010 00 0000000 20 0 OO 000000000000 04 id | Jooojoom | Ilol 0! glo! 11 !No00fS00]9 ' B 'ig ie! lg ! looolooo} , ha. 30, Iglig! 1 tologoloogjon ft, ! i LOT OrdaTo TOT OSONT TOO UP OOOTOCH th fate T ! q lion 1, }d COO,O0d]d! | tt 1, ld ' 1 bo! NO, lo it lO i, | |OOO!Q00 1 Wh ne pital igi '\oodoola | Hoy q rity re "1! leooi000] 1 it a oli; O} _11 J0,000'000)0! I} 0) is rc oe Soe Ce eee ee + 6" 0 to Oo TabeeOS Ton =o 0.0 0- Oji06 0 y-5_5_BYSYS_ Sp I O! FIEC°28 23.81 + 34.68 = 58.49 square inches. The area of section of the single stringer plate amounts to 49.91 square inches. The top strap being punched closer for calking decreases the strength per Square inch to 24 tons. The value of the butt straps to re- sist tension would be equal to 1472 tons and the plating through XX 1469 tons, so that the material for the butt strap is effective and the area of sec- tion greater than through the un- avoidable weakest section X -X, The butt strap D on top is cut clear of the stringer angle F and seam strap C on the outer stringer. The top inner strap E is cut out for the channel hatch coaming and con- tinuous seam strap and the bottom strap is cut short of the channel fore and after leaving the same amount of material in the two straps on the in- ner stringer so that the same results are found in both examples. It will be seen that the material in the butt straps are effective and the aid of the continuous seam strap and stringer angle are not considered in the calculation. Fig. 29 shows the reason for in- creasing the thickness of the top butt straps. The countersinking of the butt strap increases the size of the rivet hole-and decreases the metal in the plate, ; The advantage of making the string- er plating in two will be seen by the number of rivet holes in the space. Through the line X X there are 17 holes, while through the line of the butt strap across the two plates there are only 14 rivet holes. A system of lapped butt might be adopted and the efficiency of the riv- eting made equal to the plating through the line X X, This edge and edge arrangetment of the stringer plating as shown by sketches makes the neatest work and allows the fitting of the seam strap C practically in one piece the whole length of the hatch. openings. The continuous seam strap can be made any width or thickness and adds considerably to the strength of the vessel in assisting it to resist both tensile and compressive strains. ce 17 Fig. 30 shows butt strap arrange- ment of continuous seam strap and number of rivets one inch diameter put in same. The rivets have a double shear and are equal to 36 tons each. The material across the beam Y Y is equal to 24" -- 5" for rivet holes The single shear rivet is equal to 20.4 tons. The double shear rivet ex- ceeds the area of the material and the area of the material exceeds the single shear of rivets. Example: Rivets single shear = 20 X 20.4 = 408 tons. Rivets double shear = 20 X 36 = 720 tons. Area of section = 24 -- 5 X 26 = 494 tons. No objections are raised to having the butt strap rivets in excess of the area of section of the material, as long as the metal is not reduced by the are rangement of the rivets. The complications come in when the butt straps have to be made wa- tertight and a number of rivets put in to get the material close together. The riveting in all cases in a ship should get the preference and should always be a little in excess of the area of section. McIntyre & Henderson, Baltimore, Md., have a steel tug under way which is to be 105 ft. long, 21 ft. beam and 11 ft. deep. She will be fitted with fore-and-aft compound en- gines with cylinders 15 and 30 in. in diameter and 22-in. stroke, and will have a_ steel boiler with 150 Ibs. working pressure. T | | ----. | | A | | : Li | iD a oo 6 o10 G6 ee Cc. a oO OG olG oe. | < | Is ° oO 0,0 ° c J! Ce Pe ie pe OC 2 8fo 6 a ° || TRAP i | | °o Oo O12 Cee | | Jo jlo © © 6. 6's @€ 6 offo, 1 | | | ly bay ES yo Eo L_ j