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Although the seat or support for rotating shafts constitutes perhaps the widest application of bearing metals, any sliding contact between two surfaces is in reality a bearing and one of the surfaces must function as a bearing substance. With the almost exclusive use of metal in machinery of today, such sliding contacts are metal contacts and the bearing substance is a bearing metal. Czochralski and Welter in their book “Lagermetalle und Ihre Technologische Bewertung” give a very interesting history of the development of bearings and bearing metals, and W. M. Corse in “Bearing Metals and Bearings” presents a more recent contribution on the subject with a bibliography of published literature to as late as 1928. A cursory examination of Corse's book will give some idea of the extent of the field in which bearing metals are applicable and of the great number of widely different alloys which are at the present, or have been in the past, applied to this field.
Darby, E. R.
Chief Metallurgist, Federal Mogul Corp., Detroit, Mich.