Abstract of Patent No. 1731, C. Wells, Plymouth. Improvements in Torpedoes to Enable them to Penetrate Nets, &c. Submitted February 7, 1885. 'A number of fixed or movable knives are arranged upon the nose of the torpedo. The blades may be double, i.e., in the form of shears which are worked by mechanism within the torpedo.' (Accepted August 7, 1885).