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34 'A POPULAR TYPE OF MARINE ENGINE. One of the many British engineering firms that has made its way to the very 'front rank in building a type of marine -engine which has found favor with ma- FIG. 2.--COMPOUND SURFACE CONDENSING MARINE ENGINE FOR: COASTING STEAMER. rine engineers is» the Glenavon Engi- neering Works of Mr. James Ritchie, _of Patrick, Glasgow. Mr. Ritchie has sent us a number of photographs. show- ing standard types of compound and triple-expansion surface-condensing ma- rine engines, as designed and manufac- FIG. 6.--COMPOUND MARINE ENGINE. FOR SALVAGE STEAMER. tured by the firm, up to 1,600 I. H. P. Figure 2 shows a compound surface- condensing marine engine for a coast- ing steamer. The cylinders are 15 and 32 in., by. 24 in. stroke, boiler:.11 ft, six THE. MarRiwe REVIEW FIG. 5.--COMPOUND -SURFACE MARINE EN- GINE FOR STEAM TUG BOAT, OPEN- FRONT TYPE, inches diameter by to ft. long, with 130 pounds working pzessure. On trial the engines developed 4oo I. H. P., work ng at 120 revolutions. Figure 5 is a com- pound surface-condensing engine for a steam tug. The cylinders are 15 and 30 in, by 21 -in.; bovlet,7 11st. by? 10 it. with 130 pounds working pressure. On trial these engines developed 340 I. H. P., working at 115 revolutions per min- ute, ~The "propéller sbeing Of. a -laree area, specially designed for © effective tow-ng. Fig. 6 is a compound surface- condensing engine, 15 and 32 in. by 22 in. stroke; boiler, '11 ft. by 10 ft. with 130 pounds working pressure. These engines were built for a steam tug and salvage steamer, _and on trial developed 300' T.-H. Pat 115 revolutiwns? lie.*7 FIG, 7---TRIPLE-EXPANSION, DEN SING SURFACE-CON- MARINE ENGINE, is a set of triple-expansion engines hav- ing cylinders 12, 20 and 32 in. diameter by 24-in. stroke; boiler, 12 ft. six in. diameter by 10 ft. long, with 180 pounds working pressufe. These engines have been fitted to several steam trawlers. TRIPLE-EXPANSION: SURFACE CONDENSING MARINE ENGINE. This engine is of heavy type, being de- signed to provide easy access for re- pairs, and can be' fitted, if necessary, with steam-revers.ng gear. Working at 120 revolutions. per minute, these en- gines developed on trial 450 IJ. H. -P., vacuum 26 in. All these engines are of standard design, and are all built" to COMPOUND SURFACE CONDENSING ENGINE. pass Lloyds highest class. The en- gines are designed with a view to com- bine strength and durability with facili- ties for easy access for repair. The valve casings are placed at the end of