The vessel into which explosives have been loaded, or are being loaded, shall conspicuously display a red flag from the forepeak, of the size prescribed by the Bureau of Navigation (16 sq. ft.), and at night a red light shall be conspicuously displayed. City Code, 1927, art. 15, §58 1950, art. 11, §60 1966, art. 10, §59 1976/83, art. 10, §59 Ord. 13-336