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Published online by Cambridge University Press: 26 April 2006
A new approach to the well-known spin-up from rest problem is proposed based on a search for self-similarity. The Wedemeyer (1963) model is first tested for spin-down to rest and then used for spin-up. The general-form solution is found and is shown to tend to a self-similar limiting stage. Experimental results in a cylinder of small height-to-diameter ratio are analysed to demonstrate this self-similarity in a certain range of external parameters.