Flywheels for A-C generating units

SO MUCH has been written on the subject of flywheels and parallel operation of generating units, that the object of this paper is not to attempt to develop any entirely new method of flywheel calculation, but rather to collect and apply the available information and put it into convenient shape for practical use. The consideration of torsional vibrations in connection with the determination of flywheel sizes is frequently of the greatest importance, especially in the case of large multicylindered oil engines, and should not be overlooked. However it is beyond the scope of this paper and so will not be considered here.