EVALUATION OF WOOD PRESERVATIVES 



477 



10 20 30 40 50 60 70 80 90 



DAYS ON WEATHERING WHEEL 



Fig. 32 — Creosote losses; Ib/cu ft of the fraction below 355°C remaining in the 

 test blocks, by calculation and by ether extraction, based on weathering wheel 

 test data. See text, (a) Creosote I, 19.0 per cent residue above 355°C. (b) Creosote 

 II, 33.6 per cent residue above 355°C. 



