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"24 water that the feed system could sup- ply. The boilers, therefore, were not forced, and the air pressure was only 2.75 inches, where the fan equipment can readily maintain 4 inches. An- other feed pump with its piping has been added since the ship was de- livered to the government. The final acceptance trials of the ship took place on October 20 and 21, 1908, in a heavy northeast gale, with the following results: Pyration, Hours -.s+. 0.6. 66: 12 4 Displacement, tons ..--.--- 3800 3630 Mean revolutions per minute 479.6 590.1 Corresponding speed, knots. 23 26.1 Miles per ton of coal...... 2.3 1:5 Average air pressure, inches 0.75 2.75 Coal per E. H. P. per hours, POUNGS felis Fees a elves 8s 3.61 3.23 Coal per I. H. FP. per hour on basis of 0.55 propulsive , Goeticient < vise ces can 1.97 1.78 On these trials in a very rough sea the turbines did not race. This is a very valuable feature in connection with turbine machinery. The ship was operated on these final acceptance trials by her regular navy crew under service conditions. The coal was or- dinary run of mine taken from the government pile at the Boston navy yard. The air pressures carried were, by direction of the board, regulated to be the same as the corresponding preliminary acceptance trials. The small difference between the above results and those obtained by the contractors on the preliminary © acceptance trials is remarkable, when the quality of the coal and the con- dition of the sea are considered. The conclusion drawn by the writer from the trials of this ship is that the combination of bent tube boilers with rugged scantlings, or of other boilers capable of a high rate of forc- ing and evaporation per unit of heat- ing surface, combined with steam turbines, permits a lightness of ma- chinery installation without any sac- rifice of durability and_ reliability never before contemplated in our war ships designs. : Light machinery installations have been constructed: in the past for tor- pedo boats and destroyers, but through the use of short-life boilers of very light scantlings and delicate parts in the main engines and auxiliaries, dur- ability and reliability have been sac- rificed. The machinery of the Chester is not of this <elass. Lightness. per unit of power is obtained through thermo- dynamic efficiency and high output per unit of surface. The boilers are of rugged design and have large, thick tubes. Their casings are heavy and durable. After 14,000 miles of steaming one small part. of the casing MAIN HP TURBINE cLosinG Tre Marine REVIEW LPCRUISING TURBINE MAIN MR TURBINE. PLAN VIEW. ELEVATION, € OF SHIP, LOOKING TO PORT. Pl ] ] fif[fjt = [ste Boo ee | | STEAM STRAINER. VALVES. THROTTLE "SELF CLOSING VALVE. e- ane as omer oxen STEAM To micuum aveestvrae cigvarion SYAtSenwe sr LocuN ve o enm