Diesel engines for land and marine work . th the consump-tion of the ordinary four-cycle engine, and from thefigures obtained it appears that the difference is extremelysmall. Tests were made by different authorities on fourseparate two-cycle marine engines of standard type,after being erected in the works and before installingin the vessels for which they were built, the power beingabsorbed in each case by a brake of the Heenan & Froudetype. In the four engines tested it was found that thefuel consumption per hour was respectively 211grams., 210 grams., 201*6 grams, and 196 grams., or
Diesel engines for land and marine work . th the consump-tion of the ordinary four-cycle engine, and from thefigures obtained it appears that the difference is extremelysmall. Tests were made by different authorities on fourseparate two-cycle marine engines of standard type,after being erected in the works and before installingin the vessels for which they were built, the power beingabsorbed in each case by a brake of the Heenan & Froudetype. In the four engines tested it was found that thefuel consumption per hour was respectively 211grams., 210 grams., 201*6 grams, and 196 grams., or an aver-age of 2045 grams, or say 45 lb. per hour, which isvery much the same as for the usual four-cycle motor. Allthe engines were of the standard four-cylinder type, withtwo manoeuvring cylinders in line. An illustration of a engine is shown in Fig. 122. For larger marine Diesel motors, that is to say any-thing over about 500 , a different type of engineis built by the same firm, although many of the essential. 236 DIESEL ENGINES FOR LAND AND MARINE WORK details are embodied in the larger engine. A somewhatsimilar design, which has, however, modifications of theirown, is built by Messrs. Swan, Hunter & Wigham Richardsonin this country. As before, the motor is of the two-cycle single-actingtype, but the manoeuvring cylinders arranged in line withthe working cylinders are abolished, and replaced bycombined scavenging pumps and mancBuvring cylindersbelow the actual working cylinders. There is thus onescavenge pump for each cylinder, but the arrangement isnot exactly that adopted in many other cases and knownas the stepped piston design, since the pistons of the w^orkingcylinders and the air pump are quite separate and the airis compressed by the scavenge piston on its downward andnot on its upward stroke. The engine is, in many ways,an extremely simple one. Unlike practically every othertype, the cylinder and liner are cast in one piece, the cylinderfor the
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