holmes] 



ABORIGINAL AMERICAN ANTIQUITIES PAR-T I 



305 



FREE-HAND PRESSURE PROCESSES 



(a) Chipping thin-edged bits of stone held in one hand by abrupt 

 pressure with a bone tool held in the other hand, thus specializing 

 an implement. 



{h) Chipping thin-edged bits of stone held in one hand with a 

 pincerlike or a notched bone tool held in the other hand and moved 

 with an " impulsive twdst," thus specializing an implement. 



REST PRESSURE PROCESSES 



(a) Chipping thin-edged bits of stone held in a fixed position by pres- 

 sure with a bone tool held in the hand, thus specializing an implement. 



(h) Chipping thin-edged bits of stone held in a fixed position by 

 pressure with a pincerlike or a notched tool held in the hand, thus 

 specializing an implement. 



(c) Chipping thin-edged bits of stone held in a fixed position by 

 pressure with a bone- 

 pointed implement 

 mounted in a long 

 shaft, which is set un- 

 der the arm of the 

 operator to increase 

 the pressure, thus 

 shaping an implement. 



(d) Flaking brittle 



stone held on a rigid 

 surface or otherwise 

 fixed by pressing off 

 flakes wdth a bone- 

 pointed i m pie m e n 1 

 mounted in a long 

 shaft, which is set fio. i71. 

 against the chest or 

 shoulder of the operator to increase the pressure, thus producing 

 flake knife blades. 



(e) Chipping thin-edged bits of stone by pressing the edge against 

 a sharp-edged bone or other like object at rest, thus specializing an 

 implement. 



Free-hand pressure, next to free-hand percussion, is the most 

 important and generally useful of the primitive im- 

 Free-hand Pressure plement making fracture processes. It is adapted to 

 the shaping of small objects of brittle stone, and par- 

 ticularly to the specialization and finish of projectile points, knives, 

 drills, scrapers, and the like. The piece of stone shaped, always thin- 

 edged, was usually held between the end of the thumb and the tii)s of 

 two or three fingers of the left hand, as indicated in figure 171, or 



Fnc-liuiKl i)rt'ssure 

 lioiut. 



chippiug with a bone 



