. A manual of marine engineering: comprising the design, construction, and working of marine machinery. w &DS INTRODUCTION—TRUNK ENGINE. 13 is necessary for a certain power, it follows that any diminution in the lengthof the cylinder necessitates a corresponding increase in its diameter; hence,these very short stroke engines have abnormally large pistons for theirpower, and, consequently, an aggravation of the evil arising from the weightof the pistons. As the momentum of the pistons had to be balanced byfitting heavy balance weights opposite the cranks, to reduce the racking onthe framework,
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. w &DS INTRODUCTION—TRUNK ENGINE. 13 is necessary for a certain power, it follows that any diminution in the lengthof the cylinder necessitates a corresponding increase in its diameter; hence,these very short stroke engines have abnormally large pistons for theirpower, and, consequently, an aggravation of the evil arising from the weightof the pistons. As the momentum of the pistons had to be balanced byfitting heavy balance weights opposite the cranks, to reduce the racking onthe framework, both of engines and ship, and as these weights cannotconveniently be placed very far out from the centre of the shaft, thisclass of engine was more difficult to balance than others of the horizontaltype. It may be said, however, in their favour, that they showed themselves inpractice to be efficient in working, and, on the introduction of the com-pound engine and higher pressures of steam, they found greater favourthan in the days when, for reasons stated below, 30 lbs. pressure wasconsidered
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