Figure 215.—Broken triangular chisel, median ridge in front (C. 330):

a, front showing median ridge expanding below in a fairly wide front surface; sides chipped but touched up with grinding; curved edge; b, back; surface wide and well ground; bevel with curved edge and straight transverse chin; c, side, showing chipping also distinct chin angle; d, sections; upper, showing triangular section; lower, showing front surface, convex sides and level ground back.