cylinder in the second series 22 of the array by virtue of the fact that the weighted mass 14 of the bellows 12 are in an inverted position in the second series 22 of the array relative to the first series 20 of the array the weighted mass of each is forced downwardly and into fluid expansion by the force of gravity while the weighted mass of the first series 20 of the array are each forced downwardly in compression of the first fluids by the force of gravity the first fluids thus flow from the first series 20 into the second series 22 still referring to fig1 it may be seen that once the bellows of the first series 20 of the array have allowed the weighted mass 14 therein to compress the first fluid therein the amount of displacement of the second fluid represented thereby is less than the displacement of the fluid by the sister cylinder on the opposite side of the array in the opposite vertical position in this manner more buoyancy force is applied to the bellows in the second series of the array forcing the bellows linked one to the other around rotation members disposed above and below the array to facilitate the motion thereof still referring to fig1 this diagrammatic illustration represents the basic principles of the present invention what is not shown is a.