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PUBLISHEO BY A. 0. MACLACHLAN, S02 BOYLSTON STREET. BOSTON The following tables give the sum- mary of the results and the principal dimensions of the vessel: DIMENSIONS. Length between perpendiculars. 386 ft. 6 in. Breadth of hull molded....... 50: ft, 6.1n. Breadth over guards........... 63 ft. Depth molded .....+-.+eeeeeee 22 ft. Draught normal ............-- 16 ft. Draught at trial (mean new York to Boston). :........+% 16 €¢..2:1n: RESULTS OF BOILER TEST. Pate of test. nc: ee ce woe Jane 25, 1908 Duration of test....+--++++-+. 12 hrs. Boiler pressure average gage.. 137.8 lbs. Quality of steam............-- 95.9 Barometer 6 ks ee 29.97 in. Temperature of feed water.... . 203°.5 F. Draught of blowers (Howden). 1371 in; Number of boilers (single-end- ed: Scotch) sve. i eee oe 10 Total grate area ..:..--++++0s 756 sq. ft. Total heating surface ......... 29,520 sq. ft. Ratio heating to grate area.... 38.6 Total coal fired in 12 hrs..... 179,112 lbs. Total water fed in 12 hrs..... 2,041,710 lbs. Equivalent evaporation from and at 212° per lb. of coal.. 11:2 Coal per sq. ft. grate.....---- 19.6 RESULTS OF ENGINE TEST. Type of engine ....+-++++++-: Parson's turbine Duration of test...).....-.-+-+> 6 hrs. High-pressure gage .----++:+-:: 124.4 lbs. Low-pressure gage, average 5: Re Pe Ge aise are ain ee 21.3 Ibs. Vacuum (average S. & P.).... 27.42 in. Temperature of injection water.. 63°.5 F. Temperature of discharge water. 107° F. Temperature of hot well.....-. 110°.8 F. Total water per hr. during test. 176,010 Maximum revolutions........p. 468, c. 472, s. 472 Minimum revolutions........ p. 433, c. 444 s. 441 THe Marine REVIEW Average revolutions (6 hrs.).. 455 Maximum shaft H. P.......... 11,076 Minimum shaft H. P........-. 9525 Average shaft H. P. (6 hrs.).. 10,405 Steam for auxiliaries per hr... 22,380 Ibs. Steam (4 per cent primings) per shaft H. P. per hr, all PUFPOSES 2... see eer se rsererce 16.9 lbs. Steam (4 per cent priming) per shaft H. P.-per hr, turbines Only ei Ue ee et re 14.76 lbs. Bo LT: Uz "per: shat 41.° per minute ....- Dees te eek 265.9 Coal per shaft H. P. (average OF 6 NES.) tee arene oe 1.5 lbs. DISCUSSION. Prof. Peabody: I ask permission to append to' this paper as additional in- formation some figures given to me by Mr. McGregor, the superintending engi- neer of the Metropolitan Steamship Co. "Average Performance of Turbine Steamers Harvard and Yale from May 11, 1908, to Nov. 8, 1908, on regular ser- vice of the Metropolitan Steamship Co., between New York and Boston. "Part of the running time was on route via Long Island Sound and part by' the all ocean route; Long: Island route, 298 knots; ocean route, 326 knots, "In time given from dock to dock no deductions have been made for stop- pages nor for time ships were anchored due to fog, etc. "No delays have been caused by de- rangement of machinery nor have there been any repairs made or required to turbines." Harvard. Yale. Number of) trips.¢. 0. sas 178 179 Average 'knots per trip..... 301 303 Total "knots: vuti.: i. 8.7.51. 53,578 54,237 Hours dock to dock........ 15:15 15:34 Hours steaming. ...05....02 15.201 15:12 Mean dratight 2.20.0 .¢.. .. 15% 107 1S Average knots per hour..... 20.05 19.93 (Coal received per round trip, TONS EOS e ne senor 238 240 Coal steaming per trip, tons. 106.5 107 Coal per hour, tons........ 7.10 7.04 Port use; : tonsiin. 2 oe 12:5 13 Knots: (per ton. ..5. 2000 2.826 2.831 Average Ro P; Ma 441 443 Average boiler pressure 146 151 H.. Pe turbine. pressute..- 2... 124 125 Vacuum (avetape ....2..,.-- 2844" 2814" Prof. Peabody: The things I wish to call attention to at the present mo- ment in connection with this additional data are these, namely, that the number of tons of coal used in steaming per trip for the Harvard on the average for 179 trips is 106.5, and for the Yale on the average, 179 trips, was 107 tons. I do not know that it is necessary to read any of the other figures in this