Sur la Cohérence des Corps, Second (- Troisieme) Mémoire. (I. Problemes sur la Force et la Courbure des Lames élastiques. II. Problemes sur la Résistance des Poutres.).

(Berlin, Haude et Spener, 1768). 4to. No wrappers. Extracted from ""Mémoires de l'Academie Royale des Sciences et Belles-Lettres"", tome XXII, pp. 99-107 a. 1 folded engraved plate + pp. 108-116 a. 2 folded engraved plates.

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First appearance of two importent papers in the theory of elasticity of materials in which Bernoulli gives, for the first time, the solution to a main problem, and stating a formula which expresses the shape of the loaded beam without reference to the load acting or to the elastic properties of the materials.