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22 Dainls of the United States Scout Cruiser Chester The Chester, built and engined by the Bath Iron Works, Ltd., Bath, Me., is of interest because the ma- cchinery equipment is of a type that is novel in the United States navy. The hull was designed by the bu- reau of construction and repair of the navy department. The machinery was designed by the Bath Iron Works to fulfill a program outlined by the bureau of steam engineering and was built under the supervision of that bureau. In the preparation of the machinery .designs the Bath Iron Works were greatly aided by their correspondents, The Parsons Marine Steam Turbine Co., of Woallsend-on-Tyne, England, for the turbines; anid their © ¢x- clusive correspondents, Messrs. Au- gustin Normand & Co., of Havre, France, for the boilers. In fact, the -- *Read at the annual meeting of the Society of Naval Architects and Marine Engineers. 57£AM TO WHIBT'E AND SYREN, STEAM TO HEATING S¥S TEM £ GALLEYS. 3 STEAM TO ASM MOIST ENSINE, ; orton peer "STEAM TO ICE MACHINES EYVINDLASC. STEAM TO BLOWER ENGINES. phelch| rohan {Ts SOS HALF SECTION AT FRAME "83, LOOKING FORWARD. HALF SECTION AT FRAME °83, LOOKING AFT. SPARS gage ares ook ve 1 --ecleeeeert » 9 entamerermene # PAM MUGMENTEE, TAE Marine REVIEW BY CHARLES P. WETHERBEE, MEMBER, U,S.S. CHESTER EFFECTIVE HORSE POWER. P 23 NES KNOTS PER HOUR boilers are among the last personally designed by the late Monsieur J. A. Normand. The general arrangement of ma- chinery is shown on Plate 1. A sum- mary of the leading engineering par- preliminary acceptance trials are giv- en on Plate 2. The following curves are given on Plate 3: Revolutions and speed. Apparent slip per cent. Thrust per square inch of projected propeller blade area. Knots run per ton of coal. Effective horsepower with append- ages. Pounds of coal per effective horse- power per hour. ticulars and data observed on the four A complete description of the ship, machinery and preliminary acceptance trials is given in an article by Lieut, A. F, H. Yates, United States mavy in the May, 1908, number of the Journal of the American Society of Naval Engineers. Unfortunately the shaft horsepower was not measured on any of the trials as the torsion meters installed did not function properly. The average effective horsepowet derived from model experiments was 13,300 on the four-hour full-speed preliminary acceptance trial. The propulsive co-efficient at this speed, in the writer's opinion, is about 0.99. The machinery weights are as fol- lows: Lbs. pet I: H.-P. assuming 0.55 pro- Lbs. per pulsive C0 Tons. Tons. E.H.P. efficient. Boilers complete with all mountings including stop-valves... 229.88 269.88 45.5 25.0 Mater im holler to steaming levelise sc ce ces t cece ce eee: 40.00 fe 8 see Mippines (complete... i Ge se St er eee Be 159,75 26.6 14.6 Beating: and. bearines) 26 eee oe ve ok oe a vc 49.15 . ay ODO CUS er ae ee es ee. oo 7.96 Ve a Mate condensers incliding augmentors.. 16... 2. osseous 41.21 Steam and exhaust, suction and discharge piping, including all valves, filings, "hangers and lagping. . of... ee ok. 738.12 370.16 62.4 34.4 Auxiliaries Re ae ne ee ey ila v cte Cock 46.77 : cane sane Fittings, gear, tools, spares, steam heat, etc...........--20- 63.06 C. ste see Wipers, ladders and] oratings.. <i.) e000... eel oboe cons, 14 a eee ae BMORG Olpes atid Wprakes oa kG Boek be oo os So onc cbs §2.75 eee see WV abet, Except tn Dollers - 0.37... ce eel ce ee. 23.00 (ea nee pi Wee a, es esc, oe , | 997,79 ° 134,58