l'"rr.l. OlI.S I'OK I'lMP IkKICA'lION 



419 



1. The tenipfralurc, when 20 percent is distilled, shall nut be 

 over 373"' F. 



2. The temperature, when 90 percent is distilled, shall not be 

 over 500'" 1\ 



vX The temperature, when 50 percent is distilled, shall not be 

 over 410' F., nor over the average of the temperatures for the 20 

 licrcent and the 90 percent points. 



Foreign Substances 

 The oil shall mA contain any water or sand or paraffin wax or 

 free carbon, or any visiijle solid substance, and shall not contain over 

 .20 percent of sulphur. 



The general requirements for gas oil, as compared with gasoline 

 and diesel engine fuel oil. are shown in the accompanying table. 



Table II. mmitim; RKgfiRr:Mi:.\Ts for California fuel oils 



Test 



Color, above. 

 Odor 



Acidity, not over. 



Water, under. 



Solid substances 



Specilic gravity, above 



Flash point, under 



V^olatiUty: 



20 percent point, undci 



50 " 



90 " 



80 



Asfaltum, under 



Solidifying point, under 



Gasoline 



None 

 Sliglit 

 .Xone 



Sulfur, under .1) percent 



-Xone 



.XiMlC 



.^6" n. 



2i,ir 



X\in<: 



Gas oil 



Amber 



Trace 



.20 percent 



None 



None 



3S° B. 



120° F. 



375° F. 

 400° F. 

 500° F. 



Trace 



Diesel oil 



Trace 



.75 percent 



1 percent 



None 



23' B. 



2U0° F. 



660° F. 



25 percent 



32" F. 



It is exceedinel\' important to contract for the year's supjdy dur- 

 ing the earl}- winter. Pumi) irrigators cannot afford to take any chances, 

 either as to shortage in the supply or as to cjuality or price. The con- 

 tract should be made before the groimd is seeded, even better, before 

 the ground is plowed. The farmer may contract with a responsible 

 local dealer, but the dealers or associations of farmers should contract 

 with oil refining companies. Contracts with jobbers are less depend- 

 able. Farmers' oil associations are advisable, since the}' eliminate one 

 ])rofit. It is a good investment for a farmer to install a ,i000 or 5000- 

 gallon tank, sunk in the ground, near his pump-house, and to fill it in 



