350 



BUREAU OF AMERICAN ETHNOLOGY 



[bull. 60 



bronze were employed in IMiddle and South America for such pur- 

 poses can not be determined. Analyses of bronzes found in Peru, 

 for example, indicate a wide range of hardness. The harder would 

 have served in the direct operation of sawing stone of all kinds, 

 while the softer, as well as copper, would have served in sawing the 

 softer stones, and even the harder with the aid of sand. 



The primitive drilling arts were of prime importance to the 

 aborigines and are of exceeding interest to the stu- 

 Rotative Abrasion dont of primitive technics. Stone was rough carved 

 by picking, pecking, chipping, and gouging, where 

 particular depth or relief were not called for, but for deep excava- 

 tion and perforation the rotary processes were especially effective. 



Fig. 209. Solid stone drill points. 



11 



Fig. 210. Drill points of chipped flint. 



Drill points are of two distinct tjpes, the solid and the tubular. The 

 solid points may be any sharp or pointed stone, as illustrated in 

 figures 200 and 210, or other softer materials, mineral, animal, or 

 vegetal, utilizing sand as the abrading agent. The tubular forms 



