Research Article Impressions of cogwheel. A Medical Advisory Committee chairman's views. Br Med J 1972; 4 doi: http://dx.doi.org/10.1136/bmj.4.5835.290 (Published 04 November 1972) Cite this as: Br Med J 1972;4:290 Article Related content Metrics Responses Peer review This article has a correction. Please see:Traumatic Hindquarter Amputation - November 16, 1974 This is a PDF-only article. The first page of the PDF of this article appears below.