Earnshaw, Samuel. A treatise on statics, containing the theory of the equilibrium of forces, and examples. 3d ed., en-
larged. Cambridge (Eng.]J: Deighton, 1845. ix, 233 pp. 5 folded plates. 8°, **E5025.62
Same, 4th ed., revised. Cambridge [ing.] : Deighton, B., and Co. 1858. vii, 228 pp. 5 folded plates. ‘8°, 3945.16