Figure 26. Gong profile comparison

The most immediately apparent difference lies in the prominence and height of the shoulder A (or dudu) and the resulting depth of the adjacent wide trough between A and B (or recep). Also significant is the angle a formed by the plane between A and B and the sidewall (or bau). Corollary to this is the equal height of points A and B as compared to the mouth of the gong; it is modern practice to make point B slightly higher than point A. The large central flat lying between points B and C (or rai) slopes upward slightly compared to the modern style, in which this plane is generally parallel to the mouth. Also unlike modern construction, there is a line of very prominent hammer blows near the bottom of the sidewall; these have caused the lip of the gong to be prominently flared outward. Furthermore, the thickness of the edge (lambe) and the acute angle b it forms with the sidewall (bau) are quite different from the treatment of this area today.