Percussion

The impre ion which a body makes in falling or striking upon another, or the shock of two moving bodies. It is either direct or oblique. Direct Percu ion , is where the impulse is given in the direction of a right line perpendicular to the point of contact. Oblique Percu ion . When it is given in the direction of a line oblique to the point of contact. Centre of Percu ion . That point wherein the shock of the percutient bodies is the greatest.