Diesel engines for land and marine work . compressor of large capacity must beinstalled. Experience will determine eventually what capacity thisauxiHary machine should be, but the practice at present isto make it from half to three-quarters the capacity of thecompressor on the engine itself. When steam is provided on the vessel (see later), in orderto work the cargo ^^•inches, steering gear and other auxiliarymachinery, the auxiliary compressor is usually driven by asteam engine. As a very large number of vessels that have hitherto beenput in service are provided with steam-diiven deck andothe
Diesel engines for land and marine work . compressor of large capacity must beinstalled. Experience will determine eventually what capacity thisauxiHary machine should be, but the practice at present isto make it from half to three-quarters the capacity of thecompressor on the engine itself. When steam is provided on the vessel (see later), in orderto work the cargo ^^•inches, steering gear and other auxiliarymachinery, the auxiliary compressor is usually driven by asteam engine. As a very large number of vessels that have hitherto beenput in service are provided with steam-diiven deck andother machinery, it is not surprising that this arrangementshould have been adopted to a large extent. Withoutgoing into the question of advantages and disadvantagesof the steam drive as compared with electricity or indepen-dent oil engine operation (this point is discussed elsewhere), 196 DIESEL ENGINES FOR LAND AND MARINE WORK it may be mentioned that even on some ships wliere steamis extensively employed, an auxiliary Diesel driven com-. pressor is installed in the engine room. When the machineis, however, coupled to a steam engine, its design naturally DTEREL ENGINES FOR MARINE WORK 197 does not dilTer from ordinary practice, and both the ver-tical and quadruplex type have been commonly utilized for
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