07 
Case 8. — Lubricating oils of special grades. 
Case D. — General lubricating oils. 
Cases lO and 11 . — Paraffine, vaseline, and other com- 
mercial products — ^all having an extended and various use. 
These products are obtained by different distillations, including 
destructive distillation, and by chemical and other methods of 
treating the resulting distillates. 
Case 12. — Special grades of illuminating oils. 
Case 13. — Naphtha derivatives from crude oil. 
Case 14. — Burning oils obtained from crude oil. 
Case 15. — Residuum and its derivatives. 
Case 16. — High test illuminating oils. 
Case 17. — ^The use of petroleum products in the arts. 
Case 18. — ^The minerals of the oil strata. 
Case 16 . — A model of a modern oil refinery, and, above, a 
model of the original refinery — the one built at Cleveland, Ohio, in 
1863. 
Cases 20 and 21. — Specimens of sands, limestones, and 
shales from the various oil strata. 
Case 22. — Represents one barrel (42 gallons) of petroleum. 
About this amount is delivered every second by the pipe lines of 
the Standard Oil Company. 
HALL 72 
PLATINUn, GOLD, SILVER, AND LEAD. 
The collections in this Hall comprise the typical platinum, 
gold, silver, and lead ores, and the minerals of economic value 
that commonly enter into the composition of these ores. There 
are also to be seen here products resulting from the milling and 
metallurgical treatment of the ores. 
PLATINUM. 
Case A. — Platinum is usually found in pebble and small 
grains associated with iridium, osmium, palladium, gold, copper, 
and chromite, and was first found in the alluvial deposits of the 
river Pinte, in the district of Choco, near Popayan, in the U. S. of 
