Brake Drum : A cylindrical drum against which brake shoes are forced, or a brake band is tensioned, to slow the shaft or component on which the drum is mounted
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}