. The Street railway journal . asethere need be only two double cranks, single cranks withoverhung pins being ttsed for the outer bearings, and onlyfour main bearings would be needed, while in the formercase there would be four double cranks and seven mainliearings. In either case only half of the total power ofthe engine would be transmitted through each crank fittedon the short shaft carrying the alternator, while in marinepractice the whole power of the engine is transmittedthrough the after crank to the propeller shaft. The running conditions of such an engine driving analternator on land
. The Street railway journal . asethere need be only two double cranks, single cranks withoverhung pins being ttsed for the outer bearings, and onlyfour main bearings would be needed, while in the formercase there would be four double cranks and seven mainliearings. In either case only half of the total power ofthe engine would be transmitted through each crank fittedon the short shaft carrying the alternator, while in marinepractice the whole power of the engine is transmittedthrough the after crank to the propeller shaft. The running conditions of such an engine driving analternator on land would be much less severe than thoseof a marine engine. The latter is built on an unstablefoundation, that of the hull of the vessel, while the engineon land is supported on a solid concrete foundation. Amarine engine has to run constantly for six or eight daysand nights without intermission, and with no opportunityfor inspection and adjustment of the bearings, while in alarge power plant on land each engine may be stopped for. FRONT END AND SIDE ELEVATIONS OF 8000 HP MANHATTAN UNIT There seems to be no good reason why either of theseengines wottld not be well adapted for a power would develop in the neighborhood of r 1,000 hp atthe most economical rate of driving and at maxi-mum load, or 37^ per cent more than the Manhattan duplexengines, while the engines of the Kaiser Wilhelm der several hours each day. The marine engine has to be de-signed for economy of space occupied and for minimumweight consistent with strength, giving small factors ofsafety, while no such considerations limit the design of theland engine. The owners of an ocean-going vessel say to the engine October 5, 1901.] STREET RAILWAY JOURNAL. 451 builders, You must build us an engine of greater powerthan was ever built before, yet it must occupy the mini-mum of space and be of minimum weight; it must run foreight days and nights without stopping; it must economizefuel to the utmost degree,
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
