THEfollowing crude oils were selected for the tests: (1), ( 2), (3) one sample each of Pennsylvania, Wyoming, and California crude, as heretofore described.;1 23 (4) a sample of crude petroleum from Bigheart field, Osage County, Oklahoma, which was regarded as representative of Midcontinent oils; (5) a sample of crude petroleum from Sour Lake field. This oil was considered representative of the Gulf

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Published information regarding the variation of the viscosity of petroleum oils with temperature is, according to the observations of the authors, notably inadequate. Rel-atively few data are available in print, and in all cases there is a decided absence of information regarding the origin and history of the samples on which tests were made. The investigation reported in the present paper was undertaken by the Bureau of Mines for the purpose of obtaining figures showing the viscosity-temperature relationships of a reasonably wide range of petroleum fractions of known origin and of accurately determined physical properties.Scope and General Method of Procedure The following three crude oils were selected for the present series of tests :1-A sample of Pennsylvania crude petroleum obtained from a small refinery located in Pittsburgh, Pa. This oil was regarded as representative of the so-called "paraffin base" class.2-A sample of crude petroleum from the Sunset Field, Kern County, Cal., which was regarded as representative of the class of so-called "naphthene base" oils.3-A sample of crude petroleum from the Salt Creek Field, Natrona County, Wyo., which was regarded as representative of the class of so-called "intermediate base" oils.

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