... domain of Physics!8 .In § 14 I also obtain this part of the stress explicitly in terms of e, f , g, a, b,c, of w as a function of these quantities and of the axis and amount of rotation.But ... knowledge of (say) elementary plane trigonometry.I am much indebted to Mr G. H. A. Wilson of Clare College, Cambridge, forhelping me in the revision of the proofs, and take this opportunity of thankinghim ... mathematical sequence of the assumption thatthe potential energy of a solid is the sum of the potential energies of its elements. Assuming these facts however we can arrive at the equation of stress (11)...