Articles PREPARATIONS AND APPLIANCES Br Med J 1932; 1 doi: https://doi.org/10.1136/bmj.1.3721.809 (Published 30 April 1932) Cite this as: Br Med J 1932;1:809 Article Related content Metrics Responses Peer review Related articles Correction Correction Published: 01 May 1948; Br Med J 1 doi:10.1136/bmj.1.4556.866