Abstract: The first preferred embodiment of the subject invention is a mounted stairway built on a central single stringer which utilizes stairs horizontally adjustable with regard to inclination of the stringer. The stairs are fixed in the middle by means of splined bolts which fit into splined apertures both of the stringer and tread angles. The railing posts are screwed into bushings of the tread and secured. Brackets screwed on railing post heads have swivels holding the rails in position.The second embodiment is another option of the mounted stairway which utilizes two side stringers for wider stairs. The stairs in this case are fixed from aside by means of two splined bolts to match splined apertures of both stringers and tread angles.

Abstract: The first preferred embodiment of the subject invention is a dual rotor axial induction machine which utilizes a polyphase central stator consisting of a number of mutually isolated core segments. The primary windings of the stator induce electromotive forces in the secondary winding of both end rotors that are revolving beside the adjacent axial face of the stator. One end rotor assembly is firmly mounted on a common shaft whereas the other end rotor can be shifted around the common shaft. Through physical positioning of the moveable rotor, phase shifting of both star connected and mutually interconnected rotor windings is achieved.The second embodiment is a cage-type axial induction machine with a central stator which utilizes the protruding portion of a shaft of a driven machine. A pair of cage-type end rotors are mounted on the shaft whereas the central stator assembly is mounted to the housing of the driven machines.