Theory of a new form of the chamber crank chain

Source abstract

Abstract This particular crank mechanism in which the crank itself is fixed and the two arms rotate about the fixed crank ends, named by Reuleaux the “rotating slider crank” (“rotirende kurbelschiefe”) and by Kennedy the “turning block,” has been, as Reuleaux pointed out, the basis of more attempted applications than any other mechanism. Notwithstanding all these attempts it has had little if any practical success, at any rate for rotary pumps or motors. The reason for this want of success is largely due to the difficulty of making running joints for holding the pressure of fluids with any device except lower pairs of either the revolute or the cylindrical prism form. The following note gives the theory of a new modification of this mechanism, which, apart from any useful practical application it may have, appears to be of some scientific interest.