Summary

Charles Evans Hughes Ohio Oil Company v. Conway (281 U.S. 146…

Gravity is said to be an index of relative value of oils only in the same pool or district, and oils of different gravity are produced in the same fields and from the same tracks of land and sometimes from the same sand. But it appears that, with respect to paraffine base oils, the higher the gravity, the greater is the gasoline content which as between these oils is largely determinative of price. Gravity in such cases is a rough and familiar method of approximating the gasoline content, and in many fields price quotations of crude oil above 28 degrees are graduated according to gravity.
Source: Wikisource

Charles Evans Hughes Ohio Oil Company v. Conway (281 U.S. 146…

Whether or not this is an adequate explanation, it cannot be said that the State, from the standpoint of the Federal Constitution, could not put the same specific severance tax on the same sort of oils used in the same way, merely because particular producers of such oils might obtain different prices. There may be many reasons why one owner obtains more in gross return for the same sort of commodities than another owner, and still other reasons why the net returns of the one may be more than those of the other.
Source: Wikisource

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