http://www.legislation.gov.uk/ukpga/Geo5/11-12/28/section/4Merchant Shipping Act 1921An Act to amend the Merchant Shipping Acts 1894 to 1920.1980-01-31texttext/xmlenStatute Law Database2011-05-261996-01-01F14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .