Abstract: A fuel cell comprises a gas separator having a dense layer, with porous portions disposed on both faces of the dense layer. The fuel cell, therefore, can store excess electrolyte, and absorb volume changes in the electrolyte without accompanying "flooding". Further, the fuel cell can reduce the thickness of a unit cell, and improve the space factor to output of the fuel cell.

Abstract: A variable output generator for supplying electrical power to a specific load is cooled by a plurality of motor driven fans 112, 113, 114, 115 disposed in a generator pit 2. An appropriate number of motor driven fans for providing cooling air for the generator are energized in response to the instantaneous generator output, to thereby avoid wasteful power consumption.

Abstract: The present invention relates to a flywheel device comprised of a plurality of flywheel discs axially stacked one upon the other and interconnected by a plurality of tightening bolts. The flywheel discs act as a flywheel in their entirety and are connected to an intermediate shaft. The tightening bolts are passed through the periphery of the stacked up discs. According to the invention, an adjustment disc is introduced between the intermediate shaft and the stacked up discs and is subjected to a facing operation so that a connecting surface of the adjustment disc with the intermediate shaft compensates for any deviation caused by an accumulated dimensional error of the stacked up discs.