This article is unavailable. Au, Y. H. J., Ng, K. W. and New, R. W. (1979) The Lanchester Damper – a design procedure for optimizing the damping ratio for a cylindrical slug damper fitted to a machine element, 1979, ASME Paper No. 78-WA/DE-5. If you wish to obtain a copy please contact the author below: Joe.Au@brunel.ac.uk