NAVAL STORES 



171 



corner of the box. It is done to provide a smooth surface over which the 

 resinous exudation may flow into the box and to expose two diagonal lines 

 to guide the initial chipping. It is shown in the accompanying illus- 

 tration. 



Chipping. 



This operation consists of re-exposing the cambium layer by cutting 

 it periodically with a chipper or hack. This streak or chipping is done 



Photograph by U. S. Forest Service. 



FIG. 45. Chipping the fourth streak above a virgin box near Ocilla, Georgia. Chipping 

 is usually done every week to induce new resin flow from March to October. 



every week during the warm season, generally from March to late in 

 October, depending upon the season. The number of chippings per sea- 

 son may vary from 28 to 40, and the average is about 32. The operation 

 of chipping is shown in the accompanying illustration. For high faces, 

 up to 8 ft., a long hack sometimes called a " puller " is used. A 5 to 7 

 Ib. weight on the end of the hack facilitates the work of cutting the 



