PENETRATION AND DECAY 



369 



0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 



DEPTH OF PENETRATION IN INCHES 



Fig. 8 — Frequency curves for ciepth of penetration in twelve-pound full cell creo- 

 soted southern pine poles in line. 



2.5 

 



2.0 2.5 3.0 3.5 4.0 4.5 5.0 

 SAPWOOD THICKNESS IN INCHES 



Fig. 9 — Frequency curves for sapwood thickness in relation to failure from 

 decay in twelve-pound full cell creosoted southern pine poles penetrated less than 

 2.5 inches. 



