Morris Tube

Morris Tube, an inner tube of small calibre which can be temporarily fitted to the barrel of a breech-loading small arm or heavy gun, and from which a diminished bullet can be fired. The use of the tube enables ball practice to be carried on at times, in places, and under conditions which preclude the use of ordinary ammunition and large charges of powder. It effects, moreover, a great saving of expense. The invention is, therefore, now generally used by the British navy and army.