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April, 1909 'TAE MarRINE REVIEW DAMAGED PROPELLER OF REVENUE CuTTerR THetis AFTER RemMovaL From Swart. Sea Going Suction Dredges By Thomas M. Cornbrooks, Esq. URING 'the past five years, @| the engineer's department, p United States from 166. ft. to 300 ft. long, the ca- pacities of bins ranging from 1,000 to 31 As will be seen by the plates, the dredged material is carried in two large bins, one forward and one aft of the machinery space. In operation, the dredge is kept mov- ing forward, at a speed of about six knots per hour, with the suction pipes dragging on the bottom. The material is sucked up by 20-in. centrifugal pumps and_ discharged into bins, through pipes and distributing chutes on top of bins. By means of gates in bottom and sides of these chutes it is possible to distribute the material even- ly. As the bin fills the water is drained off by overflows through the sides. When the bins are filled the dredge proceeds to the dumping grounds and, opening the gates in bottom, drops the material The gates are operated by means of a double-cyiinder vertical engine through: worms and fixed nut on vertical rods. The officers and crew have commo- dious quarters in houses on deck and on lower deck forward and aft as shown on_ plates. The propelling machinery consists of two compound engines, steam for which is furnished by four single ended boil- ers. army, -have 3,000 cu. yds. As the design: of © all In- trying these dredges, we have contracted for a number these dredges has been similar, the de- discovered that a very large rudder is of sea-going suction dredges. These scription of one will apply to all. The necessary. This we ascribe to the have been of varying sizes, ranging latest dredge is the Galveston, just shafts being so far outboard and the = completed at the works of Maryland extreme fullness of after body. * ei x . Paper read at annual meeting Society of Steel Co., Sparrow's Point, Maryland. On plates Nos. 7 and 8 will be seen Naval Architects and Marine Engineers. oe e a Ds E (80'x 12'x 173¢' Lbs. ge) x ia ee 115 x16 x17 |_| a ae hom e : > ae be : eae re a - 20/3 i ; f | 18x 9x 17%)" Lbs., saa aa '4x 114 Nee aS ig oe 77a x Soe : oa 4 3" 2 1 : e n c « 8k 3k 7.2 Lbs, 5 3}4"x 4k 11.9 Lbs, Double sx8 se 1.2 Ls, -- tS a 16x 16"x 15 Lbs Sx 8x7 Be 15 Lbs. nf 16'x16x 15" Lbs. Lbs. __ - '15-1 up oe O is| 3" x3 ' 4'x 3x 11.1 Lbs _ eT Eh. Soe ee x Sie 1.2 TN Ubed P . oF RES 3x8x ly, =~ oD Its Lbs. S'S : @ 5" Pee PK ==Diagotal_. ote ae aa a at 13 Lb, Saha % i Main Deck T MAO 1_4 Diagonal. a x is 8 Flange |/'\ i --"-- 1b" x 314% 95.2 if Channel Hi Creniel "3x 7.2 Lbs. Fl a0 nye: | 398 f Bex 1 ne of Overflow to be Lbs. Bulb Angle |! | 14 wean eh ea S i P Staple parallel to base line d i { : t Lbs. Staple 4 Br bo 136 ube. 'le -- 5! §--- - > -- 5 ' 6 ri Top of Overflow to be <-24" - > Hi ih parallel to base line L ni i i uy xBig'x 11,9 Lbs, Ete % WH i 9" Cli 3i4'x Silk 9.8 Lbs. 135 Lbs 43¢' Lap Mt i oe oe 4'x 834"x 11,9 Lbs tt -- S S 21/3" = Hi e em = aL 8 = 9'Clip|)\ | 6'x 4'x 20 Lba aise i i e25 Lb. Plate\}! ee : Hi Mt 16 Lbs: Lower Deck P Ht a 4,374 Flange Knuckle Line Parallel to Base Line it fe hi : Be 3 Bi oe a : i Knuckle Line Parallel to Base Line ] Figs wos I~ ote se 11a bs 4 Hi g'W.I. Pipe B'W.I. Pipe |! i \ ni 3 ny \Nc1114 Lbs. i : i 2 i 3 \ Ht ow Ny Me i 5 } 3 sole o 'aes & t g it d 17% Lbs 24'x 80'x 173g é "gs = i ow (ar . 2a 201k 1736 os sS 1734 Lbs. © i 3 te £ i Fe X nr | | F cq ° we Mt hy s rn Side b--al T geN a Ls 27'x 36x 1734 Lb i oan se as 434 Lap Z tae a le i ¥ 7x 6 a it nies \ | 'Stringer | Ss Bin n Bends, spaced 2416%s : eo + He fates s sae 13,8 Lb. f a ; 4 i Y E wi i i > se atHlepper avon 6 zB Z i ir 20 Lbs. | "RS a 13,8 Lb. Bulb p ry Nid , \ oc. (AP A Ot Sect Beace | oe. 4 roe was, ho = a . Si gl j i | ' 4'Dap\ 20Lbs || + FANN ne ie ~Y y | Q aa\ Ststioe 16": 30 Ue Me rm 2 TAK 20 Ls Strom F ae ah haan \\from Frame #21 to a 3 83 to! "i fe ey 3 --e --- 20Lbs Si) GtLap Y Se 1734 Lbs > = ot, wil) = 974 ) ssd'x 4's 11.0 Logg 936" Flange Qo "Flange f 3h'Flange ye _O_ 7 | Ls 7 rich Hie cf Bte x-3hg x WHY ; | Fer ook ar 346" 8ST ip |] 21 Y | 1 1e-eargt ( = 25 Lb. 1 a wares : re gt © ws athe Mine Ba Sy , 2 sy BPS yined pe: ae {Lap =H} sx-33¢7 2004 LiF, --Fiap th ---------- : ee ; - aa = Lb. Hi tal ~ Lg Domer | Gi. -- ghar 26 ari il Lb ' 25 Lb. Doubler a's a x82 25 Lb. Intercostal HALF SECTION THROUGH AFTER BIN <2! 19pre 2159104 S04 aoe aIN -------- 23'3" HALF SECTION THROUGH FORWARD BIN. Section THroucH Bins or Unitep States Drepce GALVESTON. Be