Joshua Field (24 Aug 1821). «Foster, Rastrick & Co. of Stourbridge». Author's tour through the Midlands. Archivado desde el original el 12 de octubre de 2008. «The third engine is very handsome a 6 column engine [a beam engine with a horizontal frame raised on columns] of 30 H Power working a blowing cylinder of 5 feet, 6 feet stroke"».
Joshua Field (24 Aug 1821). «Foster, Rastrick & Co. of Stourbridge». Author's tour through the Midlands. Archivado desde el original el 12 de octubre de 2008. «The third engine is very handsome a 6 column engine [a beam engine with a horizontal frame raised on columns] of 30 H Power working a blowing cylinder of 5 feet, 6 feet stroke"».