Petroleum Resources and Industries 

 Independent Oil Producers Agency, which are more 

 or less closely affiliated, controls about 25 per cent 

 of the State's yield. The Agency includes approxi- 

 mately 170 companies. The Royal Dutch-Shell inter- 

 ests have one large producing property and are 

 actively entering into the refining and marketing 

 end of the industry. 



Figure 10 



Transportation. — One of the most important 

 items in connection with the oil industry is that 

 of transportation. Most of the oil in California is 

 transported through pipe lines varying in size from 

 four inches to ten inches in diameter, with pump 

 stations situated from six to twenty-four miles 

 apart. The daily capacities of the lines range from 

 2,500 to 30,000 barrels, depending on the size of the 

 pipe, profile of the pipe line, and the viscosity of the 

 oil handled. Tank cars carrying from 150 to 300 

 barrels are also used extensively, especially by the 

 railroads. When the oil reaches tide-water it is 

 carried by steamers or barges with capacities up to 

 65,000 barrels. (See fig. 10.) 



77 



