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THE Marine REVIEW pe 'shown that is wrong, that at full power it is nearer to 0.48 than 0.55. Mr. F..L,: DuBosqué: Dhere are many of us who would like to discuss type of boiler Mr. Wetherbee speaks of, and if he will have the kindness to give us a detailed draw- ing of it, in connection with this discussion, it would enlighten us a great deal, and be a benefit to the society and others interested in the paper, which would lead us to discuss 5 the type of boiler he speaks of. OFFICIAL: 24 HOUR TRIAL AT IZ KNOTS COURSE OFF ATLANTIC COAST. FEBRUARY 28 #29, 1908. SPEED 12.2 KNOTS. DRAFT, MEAN, 16°73. TRIM 6' BY STERN. DISPLACEMENT. MEAN 37/0 TONS. PRESH 25 10. MODERATE SWELL FROM _N.W.W. TO ROUGH SEA FROM S.E. | COURSE, (COMPASS) _E.N.E TO W.S.W. ~ VARIABLE. POCAHONTAS COAL. RUN OF MINE. the POUNDS OF COAL PER HOUR 4093}. KNOTS PER TON OF COAL 6.68, POUNDS OF COAL PER SQ. FT. OF GRATE SURFACE 17-63. SLIP OF PROPELLERS IN PER CENT OF THEIR OWN SPEED, BASED ON MEAN PITCH, */ STARBD /2.2I- *2 STARB'D 24.66 - *3 PORT 1/9.59- #4 PORT (2.08 -- MEAN SLIP 17, 48. SEE FOUR HOUR TRIAL DATA FOR FORMULA FOR SLIP OBSERVATION! 1 | 21 3|4|S5{[¢[7[8]9 [mln] iz] 3)" is] 1/71 8119) 20] 2] 22) 28] 24] 25 WE STAR, #1 |232.923371225, 61234-41234, G253.8)230.9|233.0234.71232.2)231. 2 [224.9 (231. 112434]252.0|255.2\2604|2303(229.5|23/. /\230.7|230.9)301|222.9| SAO ISHF TS|*2|268.32699266.8772.9269.4269.9268 0270.3|271.0|2699.269.6265.1|269.4\284.5296.0296,91802 5]267. 4270.5\268./|271 6271 71271.7|262.2| pYS47 j PORT |*3)253.21054.81750.1}26171262 HLS3.H258. 4255 5)239.4255.31259.11245.41240.0265 5273,91275, 7128552474 1248312485258. 258.6757.91239.3| Sezz! SHF T5}*4\23/, 1232.31229.02 32.5232. 61234 21734 31732 51028. 71228 11024 6226.00 26,01242.32.51.7 1254 4260.12299229.21230123/ 3032623178990 F. MN AIR 243. MAIN TURB. "RAS | ZA 2) 10) 519 [ol stn hestuitn Instn tr fs [7 [sls le lioins|i2in |i i95s| 66lal>} PumMP |Al | | zt Diz jz} fief edi2 fiz t tol [a fe] ee {2 {iz fie fe die | 2 | 2 | oo [ns |sie eke oo aby MAIN |F1136 | 80 | 86 | 80 | 112 | 140 134] 132 [129 | 133 |102 | 9@ | 89 [54 [97 | 97| 100] 110 [117] 18 10 |1z0|"4 | 100| foal lial Mr. Wetherbee: I do not think HLA | | . there would be any objection on the ENS. AUXIL'S Fi A FI CIRC. jAl 5 | 80} 80 fie |/20} 12/ | 22} 122 |120| n9 | 18 | 4 [122 | 97 | 102 | 127 | n9| 71 18 | 17 1120) 127 [120] 22 r21 Via FI Y REVOLUTIONS O®8 DBL STROKES iM. FEED $18 {8 {9} le {uss jasizsiae(9 [7 [i2tu [un fislizti2) ala isl oa 10 | j24 : ~PANITARY] 15] 16 | le | 5 [le [i7 Tie (20; [el 7 | lel | 2|16| te | te | 18 | te (85 19| fi] el |e) le Dety er ne ae pa 10 2 ® DYN. ENG. 406] je} = lishing that. It is an ordinary Normand wlSTI uo i . ' SBE . bent tube boiler. I do not think that TOTAL H.R FOR ALL AUXILIARIES 120 | | (MAIN G]FL139/ 159] 174] 14) | tee] 145T 156 | 16! [49 | 144 | 144 | 136] 119 | 127 | 139] 48 | 129 | 44 [led | 150] 160] 162] 152] 146] [148 | the bent tubes are vital, as there are STEAM |A| 153| 154] /59| 168 | 169] 134] 758 | 153] 149 | 163 | 148 | 148 | 123 [135] 138} 148| 128 | 440 | 156 | 157 | 148 | 150| 148 | 148 | 138 | 148 ; : oats ' : MHE-FLS 171717 tele tr ty ede tea le lestetatetetotetetetete : straight tube boilers which will give Ture. Alé |e] 7|7{7l[elele|[s|es7 les} 7]8lzs||0|0le|s|516|azlazl oles the same rate of evaporation. The : LP plF[ 3.3133 | 3.3[ 3.0] 33/35/33] 33 (33 [33/37/32 | 3 13314 [4 [S7tari37| 313 [3i3is] 133 Neves Hit rur-"*lal 3 [3 | 3 | 3 13.5[3.5|a5|38|32 {40/3 ]3]3 [a3l4 14141414 [aslaslats ls [aelsa boilers in the test are practically any type desired, express types or small light tubes, used in destroyers and HRC.- SG! 58 | 57} 70| 75 | 75 | 7 | 70| 7 | 75 | 7% | 77 | 76 | 7% | 94 (105 | 104 104| 76 | 74| 76 '76 | 74| 71| 74 743 LP C-AB| 32 | 33| 33134 | 34 | 32 13151315) 34 | 34 | 34 | 34] 35140144 | 44 | 44 | 33 | 32| 32] 33| 32) 32] 32 34.6 3 u AUX. G F175 | 172 | 150) 162 | 175 | 155} 160} 170 150 | 170} 155| 147 | 1251140 | 145 | 1551133 | 155| 1601 162 | 175| 165| 66 155 157 : uls|STEAM A] 134 | 160] 160| 169] 170| 135] 159| 155 | 152 | 155| 10| 150| 126 | 138| 14 | 15) |130| 145] 160| 160 | 5/1 153] 1501150 | 139 | 150 torpedo boats, and what I may call wl&(AUx_lFl2 [2ti life {estrslisle ies]? list) |2la 1s issl2iislai2sh2lz2i21 94 . : wlylExH. lal 2 [este [3 [4 {3 lets [4 [a [4 [asies[2 4] sis [eo] 32] 2 lesls [esies|as the battleship type, 2-in. tubes, "e| on lrlusjrol.s[olsl2tnolz{ofolololololsli|sl|7/si[si/2\|2)2{v A which I recommended a moment ago. 4 iz 5 gc al4 [Sslosl4[5[3]3lalalala laslaslas[s lo ]3151515|4 las| 4 laslaslaz M : eOWe be: ett: : : ul (S705 |F[ 20 Lo] .2 [.o[ 10] 5 [1015 |s]10l121.8 201106 [1018 }21 wliolzolmlistio| |e | Emmett: I ask Mr 'al |GLANDIALO|O|ololo|1}ololojolololololololololololololololo | Wetherbee what the gage conditions 4 "| fereelFl 212/17 ]i |2tes{islis|2 i257 |isl) [213 1s5i36l2iislsieslelele| (es were to which he refers on page 4, VAC UUMF (28. 3 (28.2128. 2128.2 128.3127, 0128.2 |28.5128.5 128. 5|28.6|28. 6|78. 0128, 0127.5 27, 828.2127. 2 28. 5|28.6|28.7|28.7|28.7)28.7 4 and I would like to know the feed HG) _* |A28, 029.0 /29.0|29.0|29.0|28.5|29. 0129. 0/28.8 128, 0129.0129.2127, 5|28.0|28.0\28.5|27,5|28. 5129.0 29.0) 29.0|29.2|29.0|29.1}28.0128.6 IBARO 'R® '29,94129.9479 9429. . 9629, 96,29, J629,98129, 9829. 9829,98)30,0 130.0 30. 130.0130. 0130.1 |30./ |30./6/30./G30./63016 0,02) | water temperature corresponding to é ; YI. DILERSI8S |156| 165 | 182 165 | 140 | 1601155 1160 | 155 | 155| 150 | 1351135] 150 | 125] 145 |150| 150] 160) 160|/65| 160| 160) 135 | ; 4 sit mK} 190 | 155] 163 | 175 | 160 | 145 | 165) 167 | 150} 150 | 150 | 145 | 130 | 135} 153 | 127] 143 | 145] 145 | 155] 150| 160| 150] 150| 130 the E15. ; 1 als ob | 185 | 152 | 1601175 | 160 | 140 | 160} 155 | 150 | 150 | 150| 145 | 130 | 130} 151 1125 | 144 | 145} 140 | 155} 155| 150 150) /55| 130 Mr. Wetherbee: The evaporation : S}ey_ "Mj 190 | 155 |162 [177 | 162 | 144 | 165 | 160 | 150 | 150150 | 1501135 | 133| 154 | 126) 146 | 150] 1451 157 | 150 | 160] 150 | 155 | 135 ' < Siz for that amount has been obtained by AVER "E18 7.5'54,2)162.5)77, 2161.7; 42.21162.51159.2)152.5)15 1,215.2 47, 5)32,51332) 182 |125.7)/44.5147.5) 145 56.753, 7V58.1152.9) 155 32-5] 152 220 degrees for the feed water supply for the boilers, and the gage pres- sure at the boiler is about 230 pounds, and those are the conditions under which the boilers will evaporate 11.5 pounds of water for any coal. I have recently been trying to get some oil burning people to guaran- tee such results, and I cannot get it. FO.FRHR|F| 182 | 140] 140] 135|128| 125! 4 | 170] 150|210| 198| 180 | 162 |208| 206|220| 200| 2001175 | 190] 158 |/52 |140 [134 167A ENG .RMIA| 76 | 72| 72 | 72| 70| 70 | 7/ | 72 | 7 | 70| 641 64| 56] 56| 54] 56162 | 74176168] 74| 82|77| 172/168 OUT. AIR| 34 | 33} 32 | 30} 3/ | 3! | 29} 29 | 28 | 26 | 24 | 23 | 23|25| 26 | 29 | 30 | 36 |3/ 132124 | 24] 26) 22 | 22| 28 FIRER'M| 58 | 56 | 70 |-48 | 46 | 52 | 50] 50| 48 | 48 | 48 | 46 [52 [52 | 52 | 521 66140 | 40144 [48 | 48 | 46 | 42 | 40 |49, RLS PYRO'R|240| 330|280|300| 315 |300|285|300|300 |3/0 |290 |300|250|260|280|260|285|350|225|220|2/0 |220|210|290|200 "W"4 1680] 7898251890| 875|875|845| 840) 850/900) 860'900| 8501855] 8901925) 9401950190018 5018501890 19001910 |e) | Blavenaae 510 15551552.) 595|5955874 56515701575 |605|575|600|550 55 2215851692.26/2, 65 015629535|530|555|555)555|540|57y, INJ- |F| 32 | 33 | 34134 { 35] 34] 38] 38] 38] 36] 36| 36| 36134138 | 38] 38| 361 341 34] 35|34|34135| [35.4 us on our torpedo boats. We in- ECTIOMA| 32 | 30132 | 321 34| 34| 36] 38 | 38| 35| 35] 35] 35| 35] 35] 38 | 38| 34] 34] 34/34] 33| 33] 34 | 34| 34 wy} | DIS |F) 4l | 44 | 46 | 46 | 44 | 34] 44143 [45 | 38] a5] 45 | 49136] 40 | 40! 50] 46 | 42 | 36| 43 | 47 | 42 | 44 42.8) stalled feed water heaters that put wl SeHAaRceAl 4s | 48 | 46 | 36 | 40 | 38 | 36 | 42 | 40 35 | 37 | 37 | 36 [37 | 37 | 40 | 40 | 38 | 36] 36 | 36] 35] 35 | 36 | 35] 39 the water into the boilers anywhere a|S|A/P P'PIF| 56 | 7/ | 74 74 | 66 | 54 | 54| 58 | 57 | 62 | 60] 59] 63 | 62] ca] 54 | 58 | 60 | 52| 55 | 54 [56 | 54] 58 60.2 : ©] u[DISCHAA! 46 | 52 | 50| 46 | 48 | 46 | 48 | 50] 52 | $2 | 47 | 47 | 48 | 47 | 48| 48 | 45 | 46 | 42 | 43 | 44 | 46 [46 | 46 | 48| 47) from 210 to 240 degrees temperature, a|S|FEED TOIF! 68 | Ge | 69| 70 | 60| 58 | 52 | 54 58 | 56 | 53 | 58 | 56| 56| 58| 62 | 60| 58) 5¢| 54|5/ | 56) 56/55 | [58.2 and you can take as an average about |SISHEATER|Al 56 | 58 | 58] 56 | 60 | 60 | 60 | 62] 6/ | 60| 58 | 58 | 58| 59| 59] 58| Go| 54 [60] 6) | 56 lez | os [er | 56 | 58 Is F i A ate it. could as well be applied to close given on page 2. Speaking from er ape Ne: UT PT DES obey oe ea es the throttle of a reciprocating engine, if found desirable. With reference to the question of exceeding the designed power by £0 per cent, I am sorry that apparently was not made clear in the paper, for the reason that I have been asked that question by several others. That statement is based on the fact that the ship was designed for an effective horsepower, necessary to give 24 knots. The effective horsepower, cor- responding to the observed speed, on the four hour trial, was about 50 per cent in round figures more than the effective horsepower necessary for 24 knots, and that is what that state- ment is based upon. In reference to Capt. Hovgaard's question, as to boiler tubes, that is memory they are 13/18 outside diam- eter, No. 10 gage. If these tubes are used on battleships, I would rec- ommend that the tubes be 2 in, and about No. 9 gage. The only fea- ture recommended by me-is the abili-- ty to stand .a high rate of forcing, which: comes. from the fact that the ~ boilers have a good circulation, and it is not necessary to have the particu- lar make of boilers used in the test, but any boiler that has a good circu- lation and will evaporate as high as 11.5 pounds of water per foot of heating surface will be equally effici- eng, Col. Stevens: Will you' state how you get at the 0.55 per cent propul- sive efficiency? Mr. Wetherbee: Recent results have None of them care to give over 11 pounds, : Capt. W. Hovgaard: I quite agree with Mr. Wetherbee, that if we could get a boiler of high evaporative power we should make a great step in ad- vance, as far as warships are con- cerned, because the pressure on the warship design of the same weight is so enormous that any movement in that direction is bound to be accept- ed, if the solution is practicable. -- In the German navy, as you per- haps know, they have adopted a small tube boiler, or at least a modification of a small tube boiler, for all classes of ships, from torpedo boats to battle- ships, and in that way they have at- tained a great uniformity in the ser-