It was in Stettin on 24 June 1905 when Dr. Hermann Fottinger was granted Patent No. 2214 22 of the German Reich for a "hydrodynamic transmission with one or several driving and one or several driven turbine wlieels for power transmission between adjacent stiafts". Originally intended for marine drives, this hydrodynamic power transmission principle was at first celebrated as an "epoch-making" invention, only to be driven out of its field of application within a few years by mechanical units with improved gear technology. The German shipbuilding industry subsequently put the Fottinger principle "ad acta". A quarter of a century went past, before the "Maschinenbauanstalt Johann Matthaus Voith" in Heidenheim, south Germany, signed a licensing agreement with the inventor on 17 April 1929, enabling Voith to utilize his idea. What were the reasons behind this? Peter Edelmann, Member of the Board of Voith AG and Chairman of the As early as 1906, Voith engineers from the turbine department had support� Board of Voith Turbo. ed Fottinger with their experiences. Through this contact, they became acquaint� ed with the function and the possibilities of the Fottinger principle. Twenty years later, when Voith received an order for the pumps and the turbines of the "Herdecke" pumped storage plant, Voith resorted to the specific advantages of a hydrodynamic coupling to enable the transmission of 36 000 HP.

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Hermann Schweickert, born 1935 in Alzey, Rheinhessen, studied Engineering at Karlsruhe Technical University. 1959 he joined J. M. Voith GmbH in Heidenheim as a research engineer in the hydraulic test laboratory of the hydro turbine department. From 1964 to 1969 he worked as research assistant at the chair for fluid machines at Karlsruhe University, where he received his Doctorate in Engineering (Dr.-Ing.) in 1968. From 1969 until 1998 he held senior posts in design and sales again at Voith in Heidenheim, Business Division "Hydro Turbines". Following his professional career he went back to science for post-graduate studies at the Historic Institute of Stuttgart University, Department for Science and Engineering History, from 1998 until 2001, before he received his Doctorate in philosophy (Dr. phil.) in 2002.

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