There are many methods of removing the bruises from brass instruments, the position of the bruise de-terminingthe method to be employed. In some cases, to avoid taking the instrument to pieces, the top of a piece of stout brass wire is soldered to the indented spot, and the brass is then pulled up. This is, however, only practicable in the case of slight dents. Where the dent is in the smaller tubings or too far round the main bow to be accessible from the bell, the instrument must be taken to pieces at the joints and the bruises removed by means of a series of steel balls of graduated sizes, which are screwed on a curved and tapered steel arm fixed in a vice. The ball should fit the bore of the tube to be trued. This is then thrust over the arm, and the bruise pressed up from the inside by the steel ball. If the dents are sufficiently near to one end of the tube, a burnisher can be employed to remove them. The burnisher has the curve of its face equal to the curvature of the tube. The burnisher is merely placed in the tube and worked to and fro over the dent until it is smoothed out.