The accompanying sketch shows a useful form of purfling gauge, easily made and very effective. A is a sliding bar carrying the cutter and wedge, B is the wedge for fixing the sliding bar, and C is a hardwood stock with the bottom rounded on one side as at D. The method of using is to set the cutter, which must be well sharpened, to the required distance, and to go round the violin, being very careful not to cut too deep; then reduce the width by 1/16 in. and cut the outer line. The wood between the lines can then be picked out with a bent purfling chisel, and the purfling fitted and glued. The mitres at the corners must be perfectly true; an examination of a good violin will show how this should be done.

Gauge for Inlaying Purfling on Violin.