too 



90 



80 



70 



60 



§50 



o 



z 

 o 



O 40 

 UJ 



< 



m 30 



20 



10 



5 6 7 



YEARS 



8 9 



Fig. 19 — ^Depreciation curves for ^-inch southern pine sapwood stakes treated 

 with creosote, BTL No. 5283, empty-cell and full-cell (toluene dilution) processes, 

 and with greensalt K; Gulf port test plot. See text, Tables XII-XIII, and com- 

 panion Figs. 20, 21 and 22. 



100 



90 



80 



2 70 

 O 



a. 



UJ 

 OL 



60 



50 



O 



z 

 o 



«-> 40 



30 



20 



to 



1 23456 78 910 11 12 



YEARS 



Fig. 20 — Depreciation curves for ^-inch southern pine sapwood stakes treated 

 with creosote. BTL No. 5286B. 



436 



