EINSTEIN, Albert. & Otto Stern. Einige Argumente für die Annahme einer molekularen Agitation beim absoluten Nullpunkt.
Leipzig: Johann Ambrosius Barth, 1913. First edition, author's presentation offprint issue.

Scarce offprint issue, with 'Überricht vom Verfasseren' printed on front wrapper. In this paper (coauthored with Nobel laureate Otto Stern) two expressions, given by Planck, for the energy of a Planck oscillator are examined. To obtain a decision between the two expressions, Einstein and Stern note that one could greatly benefit from a monochromatic system, whoes frequency value could be changed independantly of its temperatur. Such systems do not exist, however, in a recent paper Nernst had shown that in thermal relationships rotating gas molecules behave very similarly to monochromatic systems. Using the measurements of Eucken on the specific heat of hydrogen they are able to demonstrate that only one of the two expressions given by Planck can hold.

8vo: 224 x 143 mm. Original printed wrappers. Slight vertical crease, otherwise in fine condition. Offprint from: Annalen der Physik, vol. 40, pp. 551-560. Weil 53, Boni 51. Weil mentions (p.4) that only few of these offprints were made of Einstein's papers from before 1914.