FOREST INSTRUMENTS. 151 
Bic maemcmmpeeng, 
"ER ort enemas <7 
Figure 42. The accretion borer, showing handle, hollow auger, with- 
drawing pin and a core of wood extracted. The handle is hollow, with 
screw caps, so that the other parts may be carried inside when not in use. 
Figure 43. Using the accretion borer on the trunk of a tree. 
