Hermann von Helmholtz, by Leo Koenigsberger. Tr. by Frances A. Welby with a preface by Lord Kelvin. Hermann von Helmholtz. English Koenigsberger, Leo, 1837-1921. Welby, Frances A. (Frances Alice), tr. Helmholtz, Hermann von, 1821-1894. Q143.H5 K9 925 VOK Oxford, Clarendon press, 1906. 1906. 1906 Text xvii, [1], 440 p. eng engger