Abstract: The fuel cell of this invention has the following electrolyte plate and separator plate.An electrolyte plate made of ceramics which is interposed between an anode and a cathode which are arranged opposite to each other.A separator plate which is laminated on the back surface of each of the anode and cathode and which is made of such a material and in such a composition that the expansion coefficient thereof is nearly equal to that of the electrolyte plate.According to the above construction, tensile stress applied to the electrolyte plate due to a change in temperature can be reduced and cracking of the electrolyte plate which may occur with lapse of time can be prevented.

Abstract: A plurality of turbine buckets annularly arranged around a rotor are each provided with a ledge disposed at right angles to the outer surface of each bucket. Each ledge includes a leading end portion and a trailing end portion each formed therein with a vertical hole, leading and trailing end portions of the ledge of each turbine bucket extending in opposite directions on both sides of the bucket. There are provided cover pieces each interposed between ends of the adjacent two turbine buckets and formed on the upper surface with a plurality or cylindrical projections adapted to be loosely received in the vertical holes formed in the ledges of the adjacent two turbine buckets.