71 



treating cylinder, measuring tanks,, operating or storage tank, at the 

 option of the inspector. The samples of creosote oil thus taken are to 

 be sent to the purchaser for analysis, unless the inspector be qualified 

 by both training and experience to make these analyses and the pur- 

 chaser authorizes him in writing to conduct such analyses at the plant. 

 In this case the creosoting company shall provide the inspector with 

 the necessary chemicals and laboratory equipment for carrying on this 

 phase of the inspection. 



5. The fact that the purchaser has an inspector at the plant will 

 not relieve the creosoting company of the responsibility of seeing that 

 the treatment of all material is properly done, and the agreed penetra- 

 tion of oil secured in each case as specified for the contract absorption. 



6. The inspector shall have access to all parts of the plant which 

 have to do with the treatment of material under his charge. 



Notes on Creosote Oil Specification 



The detailed modifications of the standard specification of this As- 

 sociation for ties and structural timbers which are involved in the 

 tentative specification above given are embraced in the following 

 clauses: 



Clause 3. The specific gravity of the oil at 38 C. com- 

 pared with water at 15.5 C. shall be not less than 1.045. 



Clause 4. The oil shall contain from 5 to 10% tar acids. 

 Clause 5. The oil shall contain not less than 10% naph- 

 thalene. 



Clause 6. (new distillation limits). Up to 315 C. not less 

 than 45% or more than 75%. Up to 355 C. not less than 70% 

 or more than 90%. 



Clause 7 (second paragraph). The specific gravity of 

 the fraction between 315 C. and 355 C shall be net less than 

 1.09 at 38 compared with water at 15.5 C. 



Clause 3. This clause is largely dependent upon clauses 6 and 7 

 and will be discussed in connection with them. 



ChniHc .'/. Records are available in San Francisco to show that 20 

 years ago the average tar acid content of creosote oils was in the neigh- 

 borhood of 8 or 9 per cent. In the analyses of Long Wharf piling the 

 tar acid content of the extracted oils averaged nearly 4 per cent, and 

 was doubtless higher than that in the original oils before treatment. 



Clause "). The requirement of a moderate naphthalene content is 

 again based upon the conservative position with rer-pect to the incom- 

 pleteness of present knowledge, that it is desirable to require in the 

 oil those constituents which were present in considerable amount in 

 the whole oils which in past years have proved effective; of which 



