144 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1953 



Table I — Full-Cell Treatment 

 Soil block tests with creosote (No. 5340, see Table II) and with pentachloro- 

 phenol-petroleum (4.92 per cent in Standard of New Jersey No. 2105 Process 

 oil) in toluene; absorption and retention of preservative data for parallel com- 

 parative tests. 



* Absorption is the total amount of the treating solution picked up at treat- 

 ment, that is, the gain in weight, including both preservative and the toluene 

 carrier. 



t C is the concentration of the preservative, e.g., creosote or penta petroleum, 

 in the treating solution, in grams per 100 ml. 



for pentachlorophenol alone, without regard to the petroleum carrier, 

 also plotted from data in Table I. The scale on the abscissa represents 

 the concentration of either the creosote or the pentachlorophenol solu- 

 tion. The ordinate represents pounds per cubic foot retained by the 

 blocks, calculated from the pickup during treatment and from the con- 

 centration of the creosote or pentachlorophenol in the treating solution. 



The Amount of Preservative in the Blocks 



The use of these gradient concentrations is a continuation of the 

 procedure worked out in the earlier stages^^' *^ of the Madison tests. 



