6800 Å. This work may or may not have been complementary to E. Warburg work and theories. It was subsequently refined and expanded by R. Houston and O. Biermacher and others. See also Pyotr Lebedev References Sources Further reading D. Appleton (1894). The Popular Science Monthly. New York: D. Appleton. Page 270. Hortvet, J. (1902). A manual of elementary practical physics. Minneapolis: H.W. Wilson. Page 119+. Stefan L. Wolff, August Kundt (1839–1894): Die Karriere eines Experimentalphysikers, Physis 29.2 (1992), S. 403-446. 1839 births 1894 deaths People from Schwerin 19th-century German physicists Academic staff of the University of Strasbourg Recipients of the Pour le Mérite (civil class) Academic staff of ETH Zurich