EINSTEIN, ALBERT.

Thermodynamische Begründung des photochemischen Äquivalentgesetzes; (Withbound:) Nachtrag zu meiner Arbeit:"Thermodynamische Begründung des photochemischen Aquivalentgesetzes; (Withbound:) Zur Theorie des statischen Gravitationsfeldes; (Withbound:) Antwort auf eine Bemerkung von J. Stark: "Über eine Anwendung des Planckschen Elementargesetzes..."; (Withbound:) Relativität und Gravitation. Erwiderung auf eine Bemerkung von M. Abraham;

Leipzig, J.A. Barth, 1912. Bound in two contemp. hcalf, richly gilt spine and one later full cloth. A library stamp on the first volume. "Annalen der Physik. Vierte Folge. Band 37 (und) 38. Hrsg. von W. Wien und M. Planck." VIII,1048;VIII,1064 pp., 5+8 plates. Einstein papers: pp. 832-38 (vol.37), pp. 881-84 (Nachtrag vol. 38); pp. 443-458 (vol. 38); p. 888 (vol. 38); pp. 1059-1064 (vol. 38); Planck: pp. 642-656. Internally fine and clean. Both volumes offered.

All papers first edition. In the first paper "Thermodynamical derivation of the photochemical equivalence", Einstein calls "the law of photochemical equivalence" the statement that the decomposition of one gram equivalent of any substance by a photochemical proces demands the radiation energy of 'Nhv' (where N=the Avogadro number). In this paper he demonstrates how this law is deducible by purely thermodynamical arguments, if certain olausible assumotions are made. (Lanzos). - The second paper "Concerning the theory of a static gravitational field" states that the 'equivalence hypothesis' permits us to come to very definite conclusions about the behaviour of a static gravitational field.. - The next Einstein paper gives an answer to J. Stark, as Stark claimed priority to the photochemical equivalence law. - In the last paper "Relativity and Gravitation. Reply to a remark of M. Abraham" Einstein elaborates his answer to the critique of M. Abraham. - Weil Nos 46 (1-2) a. 48. - Planck, Akademie No 95.

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