REPORT OF THE PISH AND GAME COMMISSION. 



131 



This type was experimented upon, some changes and improvements 

 effected, and the perfected and model installation made by the engi- 

 neers of the Oakland plant of the Pacific Gas and Electric Company. 

 Butters filters are now in use in Oakland, San Jose, San Francisco 

 (Potrero plant), and Santa Rosa. The Pacific Gas and Electric Com- 

 pany plans to install this system also at San Rafael and Vallejo, and 

 will in time use it in all plants making 200,000 cubic feet or more of 

 gas per day. Butters "leaves" are also being used in the dewatering 

 box of the Oliver filter at the Metropolitan plant of the same company 



Fig. 80. Butters filter at Santa Rosa. Handles 

 lampblack from 375,000 cubic feet of 

 gas per day. Photograph by A. M. 

 Fairfield. 



in San Francisco. The Western States Gas and Electric Company has 

 been advised that an adequate filter must be installed at its Stockton 

 plant. They will, undoubtedly, choose the Butters filter, as being the 

 most efficient and economical. 



The leakage of oil into our waters is a serious source of danger to 

 fish, and the efforts to avoid this danger entail the expenditure of large 

 sums annually. Oil is most frequently discharged in the waters of 

 California because of accident, due to the breaking of pipe line, or the 

 bursting of a hose of a tank vessel being loaded or discharged. Such 

 accidents are deplorable and often cause great damage. When the 

 Standard Oil Tanker Bradford went aground on the San Francisco bar 

 it was necessary to jettison 2000 barrels of oil in order to float the ship. 



