152 OIL FIELDS OF TEXAS-LOUISIANA COASTAL PLAIN, [bull. 212. 
The viscosity of the residues from the open-dish evaporation of tin 
Beaumont oil is as follows: 
Viscosity of residues of Beaumont oil. 
7 hours at 205° C. , 400° F . . Quick flow. 
49 hours at 205° C, 400° F. _. Solid. 
Penetration, 8°-10°. 
A similar but softer pitch made by boiling the crude oil for twenty 
hours in an open dish had the following properties compared with a 
D grade residue or paving asphalt from Los Angeles oil: 
Character of residues of Beaumont and California oils. 
Penetration 
Specific gravity 
Bitumen soluble in 88° naphtha 
Bitumen soluble in 62° naphtha 
Fixed carbon 
Beaumont. 
78° 
. 9943 
78.3 
84. 3 
8.7 
California. 
78° 
.9964 
74. 4 
81.6 
15 
Richardson has called attention to the peculiar conditions under 
which the sulphur exists in the Beaumont petroleums and the prob- 
ability of the presence of free sulphur which might account for the 
variability in character of the product obtained on varying the condi- 
tions under which the oil is heated, the amount of hard residue reach- 
ing in some cases to no more than 10 per cent and under other 
conditions to as much as 35 per cent. 
Distilled in vacuo at a point where boiling ceased to go on without 
cracking, one of the samples from Beaumont gave distillates better 
suited for examinations as to the character of the hydrocarbons which 
make up the oil than those from the Engler flasks. Comparisons of 
the distillates from Corsicana, Sour Lake, and California oils show 
that the Beaumont petroleum is more closely related, as would be 
expected, to the Sour Lake than to the other oils. 
Specific gravity of fractions boiling between 100° -175° C. 
100° -150 
Beaumont 
Sour Lake 
Corsicana 
California 
