14 Schwartz & Beevor, Dawn of Human Intention. 



edge, which is parallel to the axis of the forearm, rests 

 perpendicularly upon the surface of the work. 



(51) In order to realise exactly the mode of operation 

 of this class of tool, it is necessary to consider the 

 behaviour of a thin flint edtrc when actuatedin various 



ways. 





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 AfH^ar use as a 

 Scrap*'' a/vci y 



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i/se. as isScro/ier: 



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(52; When such an edge is posed perpendicularly to 

 the work and pulled under pressure towards the operator, 

 a regular line of minute flakes is formed on the side of 

 the edge away from the operator. 



(53) The tool should be used in one direction onl)-, 

 and after the edge has becouic dulled, it can be re- 

 sharpened by striking with another stone from the side of 

 the tool which faces the operatoi; when in use, a series of 



