7 3 0 D O C . 4 6 6 T H E F L E T T N E R S H I P ADft. Einstein 1934, pp. 263–269. [1 049]. [1]Dated on the assumption that Einstein was requested to write the article when visiting the pub- lisher of La Prensa (see Doc. 455, entry for 30 March 1925), but not later than the date of publication (see the following document). [2]Anton Flettner (1885–1961) was a German engineer, director of Instituut voor Aero- en Hydro- Dynamiek in Amsterdam. Although the rotor ship he had invented made its first voyage from Danzig to Scotland in early February 1925, it had earlier garnered much attention in the press (see, e.g., Seybold 1925, Flettner 1926). [3]Leonhard Euler (1707–1783) was a Swiss mathematician and physicist. [4]Daniel Bernoulli (1700–1782), a Dutch-Swiss mathematician, formulated his principle in Bernoulli 1738. [5]Magnus 1853. Heinrich Magnus (1802–1870) was Professor of Physics and Technology at the University of Berlin. [6]Peter Pringsheim demonstrated Magnus’s experiments with the original setup at a meeting of the Physikalische Gesellschaft zu Berlin, and mentioned Flettner’s invention, too. The lecture was pub- lished on 16 January 1925 (Pringsheim 1925), i.e., before Einstein left for South America in March. [7]Rayleigh 1877. John William Strutt (1842–1919), 3d Baron Rayleigh. [8]Prandtl 1925. This paper was published on 6 February 1925 (Pringsheim 1925). [9]Flettner narrated the development of the rotor ship in Flettner 1926. On his relationship with Ludwig Prandtl’s investigations, see Prandtl 1925.