RUBBER 



485 



stem, up to about 5 feet from the base vertically, into quarters; 

 one quarter at a time or alternate quarters on reverse sides, may 

 be operated on simultaneously. This area is marked off with 1 to 3 

 (now usually 2) wide V's cut about a foot apart vertically, and 

 joined by a vertical central channel. For young trees with a small 



2 3 4 



SOME TAPPING KNIVES IN USE. 



1 . Pask's " Universal " Knife 



2. Miller's Knife 



3. Sculfer Knife 



4. The Lanka Knife 



5. The Scorpion Knife 



circumference, the system of cutting a single large V or Y at 12 to 

 18 inches from the base of the stem has found favour, this being 

 followed by a second V or Y cut on the reverse side, when the 

 stem is large enough. A thin shaving (not less than 20 to the inch) 

 is taken off the lower side of each cut every alternate day or so 



