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Leopold Nowack (1892-1931)
1931 Obituary 
Dr.-phil. LEOPOLD NOWACK, Privatdozent at the Technische Hochschule, Karlsruhe, chief metallurgist of the metallographic laboratory of the Deutsche Gold-und Silber-Scheideanstalt, Zweigniederlassung Pforzheim, died suddenly on March 29, 1931, at the age of thirty-eight.
Dr. Nowack was born on November 4, 1892, at Mainz am Rhein. He studied at the Universities of Freiburg and Gottingen, and graduated at the latter under Professor G. Tammann, with a paper on "The Chemical and Galvanic Reaction Limits of Solid Solutions of Copper-Nickel, Palladium-Copper, and Palladium-Silver."
In 1917 he entered the service of the Deutsche Gold- and Silber-Scheideanstalt, becoming head of the metallographic laboratory of the Pforzheim branch in 1925. He was appointed lecturer at the Technische Hochschule, Karlsruhe, on the publication of a paper on " Age-Hardenable Noble Metal Alloys."
In 1928 he became head of the Fachausschuss fur Edelmetalle in der deutschen Gesellschaft fur Metallkunde, the meetings of which have always attracted the attention and acknowledgment of metallurgists. In the section for soldering of the Deutsche Gesellschaft fur Metallkunde he worked on the problem of soldering of precious metals, and as one of the most active members of the section for non-ferrous metals he worked for the standardization of the precious metals and of dental alloys.
He published numerous articles in metallurgical and dental journals on age-hardening of precious metal alloys; the influence of traces of bismuth, lead, tin, &c., on the properties of gold alloys ; corrosion and tarnishing of precious metal alloys ; dental alloys ; dental casting problems ; dental amalgams ; and " white gold " alloys. With his extensive scientific knowledge, he combined a love for Nature and great kindness of heart. His death is a heavy loss to all research workers on the precious metals.
Dr. Nowack was elected a Member of the Institute of Metals on April 11, 1929.