Über eine Methode zur Bestimmung des Verhältnisses der transversalen und longitudinalen Masse der Elektrons:

Leipzig, J. A. Barth, 1906. Contemp. hcloth. Light wear to edges. A small tear at upper part of fronthinge. ""Annalen der Physik. Vierte Folge. Band 21. Hrsg. von W.Wien und M. Planck"". VIII,1056 pp.and 9 plates. Einstein paper: pp. 583-86. Internally clean and fine. The whole volume offered.

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First edition. Einsten describes in this paper ""Method for the determination of the ratio of the transversal to the longitudinal mass of the electron"", an apparatus which would make it possible to determine with great accuracy the law according to which the mass of the electron changes with the velocity. - Weil No 14.