CONTENTS 



PAGK 



Introduction 397 



History of punii) irri<;ation in Arizona 397 



Tlie price advance of Fehrnary, 1^20 399 



Freight rates on fncl oils 400 



Fuel oils available in Arizona 401 



Tops or gas oil 402 



27-plns oil 404 



24-plns oil 404 



Boiler fnel oil 405 



Tests 405 



Gravity 405 



Flash poin t 406 



lUirning point 407 



P>oiling rans^c 407 



Solidifying })oint 408 



vSulphtn- content 408 



\\'ater and sand conlml 408 



Thermal value 40') 



Other tests 409 



Tests of fuel oils at the Agricultural lv\i)erinient Station 40'' 



Specifications 418 



The outlook for pump irrigation 420 



Alternative sourcc-s of power '. 421 



Conclusions 424 



ILLUSTRATIONS 



Apparatus for testing fuel oils Cover cut 



Fig. L Relation of freight rates to gi-avily of fuel nils. . . I^'rontispiecc 



Fig, 2. Boiling ranges or three samples of gasoline 414 



Fig. 3. Boiling ranges of three samples of gas (lil 415 



Fig. 4. Boiling ranges of three samples of kerosene 415 



Fig. 5. Boiling ranges of four samples of gas oil 416 



Fig. 6. Boiling ranges of 27 -plus oil, 24-plu? oil. and a gas oil .... 417 



