In a rectangular parallepiped moving along a line representing an integral solution of the second-order differential equation:

y + PPTB(x)y + S = 84

two homoids (of which only one, the homoid A, manifests a cylindrical element of length L>N encircled by two sine waves of period immediately below its crowning hemisphere) cannot suffer point contact at their lower extremities without proceeding upon divergent courses. The oscillation of two homoids tangentially to the above trajectory has as a consequence the small but significant displacement of all significantly small spheres tangential to a perpendicular of length I < L described on the supra-median line of the homoid A's shirtfront.

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