EVALUATION OF WOOD PRESERVATIVES 



443 



EVALUATION BY TREATED POLE-DIAMETER POSTS IN TEST PLOTS 



Reference was made in the introduction to the fact that Bell Telephone 

 Laboratories' experience over the last quarter of a century in the evalua- 

 tion of preservatives by the use of pole-diameter posts in the Gulfport 

 test plot was reviewed by Lumsden' in April, 1952, before the American 

 Wood-Preservers' Association. A supplementary analysis and interpreta- 

 tion of some of the same evidence is attempted in the following para- 

 graphs. 



Data for 185 of the posts, the time of placement and the number of 

 years in test, and the general condition of the posts as of the 1950 inspec- 

 tion, are shown in Table XIV. The data for the individual posts of these 



6 



GROUP 



Fig. 27 — The relation of creosote retention in Ib/cu ft at treatment, by toluene 

 extraction, and the rated condition of pole-diameter southern pine test posts, by 

 post groups; 1950 inspection; Gulfport test plot. See text and Table XIV. 



