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MIO SHIP in addition has a jacketed liner in the barrel. Steam used or condensed in these jackets is carried to traps and is discharged to the feed and filter tank in order to recover all the heat possible. A considerable conservation of heat and a reduction in condensa- tion is made possible by so steam jacketing the cylinders. It is not the Prosser type in which the entire sur- face of the cylinders is jacketed, but it is a step in this direction, and the results obtained on the trial trip demonstrated to. the satisfaction of the engineers concerned that it is dis- . br p— Atay oo 1c et t+} —} 4 J} —— tr SECTION MIDSHIP SECTION OF THE S. 8S. HARRY COULBY tinctly advantageous as far as it goes. There is also an advantage in this type of cylinder construction in that the heads having double walls heavily ribbed are much stronger and the cast- ing more durable. The main engine bed plate is of cast iron of the girder type and has four bearings of 13%-inch bore. It is supported at the center of the ship by a steel foundation and is fitted on cast iron blocks. The bed plate and foundation thus give a solid and rigid support to the engine. There are three back columns each carrying a — =p LENGTH OVERALL.------------- LENGTH BETWN. PERPS BREAOTH MOULOED------ DEPTH MOULOED-----------------:--------------+ slipper guide. There are four front columns of massive design. By this arrangement easy access is afforded to all bearings and connections. Con- necting rods are an even 9 feet from center to center with bolt connections to the bottom end boxes and wedge adjustments for the top end brasses. The crossheads are of cast steel, in this case polished all over for appear- ance. Good Material and Ample Size Packing on all three piston rods and valve rods is of the C. Lee Cook Mfg. Co.’s make. Pistons are of box type strongly constructed and are al) supplied with C. Lee Cook’s metallic graphitic iron packing rings. In the high pressure cylinder these rings are suitable for 80 degrees superheat. Throughout, the main engine is of massive design and the shafting and working parts are considerably above the requirements of Lloyd’s and Amer- ican Bureau. Piston rods and cross- head pins are unusually large and are made from special high carbon steel of about 80,000 pounds per square inch tensile strength. The crankshaft and the webs were forged from Lloyd’s and American Bureau ingot steel re- quirements. A standard horseshoe type of thrust bearing is used so designed that the PRINCIPAL DIMENSIONS HOLD No HOLD No.3 TRIMMED ; ISS 454 cu.FT. TRIMMEO 182,020 CU.FT. "SELF TRIMD. 131,500 CUFT. SELF TRIMD. 186,046 CUFT. Ae palo hee retro Laer meister cotta Caters pr eemmrere neta te tan spare tipursy st hope ret] seamen in fat 3 ~ os: eet oa Nh ou 01 Bk a ft faa tc Ok PD pacts! Piet id ta db fipqe tangs Fink ol ' ea A ge a ee LISS a ee ek SY AVY a dB eT UAE ea we tO lf YE hb a ge arias | 17 OS 160 ss 1S0 “s 40 wl Bo ae 0 as "Ss 16 oe ee Co ORR, ft In Fos CS ORS SS eee oo SURE: OES, Pak erst: SIRES aE eRe ee ea EOE EERE SEINE pee | a a ee ee Lb =| Pate be car | Ped 1 poe | Sera a a ! | |] Se OUT BOARD PROFILE AND PLAN VIEW OF THE 6S. S. HARRY COULBY, THE LARGEST AMERICAN LAKE MARINE REVIEW—October, 1927