Abstract of Patent No. 9121, W. J. Murphy and J. R. Foster, Richmond, Cork. Rifled Torpedoes. Submitted June 18, 1884. 'The submarine torpedo is constructed of a cylindrical form, and with spiral feathers or fins along the outer surface of the exterior case, so as to impart rotation along the longer axis of the torpedo when it is propelled under water.' (Accepted April 24, 1885).