A.M. Atterberg works in the field of plasticy and sedimentation of soils. The Atterberg sedimentation technique is an important method for separating clays and clay minerals into fractions. See: Bergaya F, Beneke K, Lagaly G (2001) History and perspectives of clay science ECGA Newsletter No. 4 (2001) 5-41 Also: http://www.unikiel.de:8080/anorg/lagaly/ECGA/history.htm k. beneke@email.uni-kiel.de