The economics of petroleum . nclude some of the lighter kerosene cuts haveaugmented the supply of gasoline, the main increment to the normalquantity is now the contribution from cracking stills. A rough viewof the growth of the various components entering into the gasolinesupply is shown in Fig. 52, page 116. Natural Gasoline.—The potential supply of natural gasoline hasbeen calculated from the character and output of the crude petro-leum produced in the various states and imported, and the resultsare plotted in Fig. 134 against the actual production of gasoline. Thechart shows clearly that up
The economics of petroleum . nclude some of the lighter kerosene cuts haveaugmented the supply of gasoline, the main increment to the normalquantity is now the contribution from cracking stills. A rough viewof the growth of the various components entering into the gasolinesupply is shown in Fig. 52, page 116. Natural Gasoline.—The potential supply of natural gasoline hasbeen calculated from the character and output of the crude petro-leum produced in the various states and imported, and the resultsare plotted in Fig. 134 against the actual production of gasoline. Thechart shows clearly that up to 1917 more natural gasoline was presentin the crude petroleum consumed than was necessary- to meet gasolinerequirements, whereas after that year supplementaiy sources of NATURAL GASOLINE 275 gasoline were necessary to fill the demand. The chart alsoout the important part played by the high-gasoline crudesNorth Texas field in 1919-1920. Projecting forward the dataespecially in the light of the growing importance of low-g. 1900 1905 1910 1915 1920 l)rings of the shown, asoline MILLIONS OFBARRELS B 105 O120 Fk;. 134.—Chart showing the natural-gasoline content of the crude petroleumannually produced in the United States by fields and imported during theperiod, 1900-1920. crudes, it would appear that the available natural gasoline will showa slowing rate of increase in the face of an accelerating tendency will increase the burden falling upon cracking andcreate a gasoline shortage in the failure of cracking to expand withsufficient rapidity. Fig. 134 will repay careful consideration, as itdissects and measures the trend of the component parts of the largestcontributor to the gasoline supply. 276 THE ECONOMIC SIGNIFICANCE OF CRACKING Casing-head Gasoline.—A significant production of a highlyvolatile gasoline, called casing-head gasohne, is won from natural relatively new source of supply has made important contribu-tions, approximating in 1920 about one-
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