Rayleigh’s theory of surface tension, based on the quadrant theorem, is extended to solids and presented in a simple general form.The quadrant theorem is generalized to embrace the traction of a half-space upon a wedge in contact with it, and Young’s equation for the angle of contact is derived as a condition of equilibrium between the surface tension of the liquid and the tangential traction of the solid half-space upon the liquid wedge. The historical theories of capillarity are correlated with the general theory.
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E. Orowan (1970) studied this question.