71 
Case 16. — Special grades of lubricating oils. These include 
spindle, sewing machine, screw cutting and engine oils. They are 
light bodied and quick feeding as compared with the cylinder oils. 
Case 17.”~General lubricating oils, including miners’ oil, 
leather oil and various engine oils. 
Cases 18 and 19. — By-products of petroleum. These 
include paraffine wax, crude, semi-refined and refined, with illus- 
trations of its uses for candles, matches, tapers, etc ; axle grease, 
lantern oil, harness oil, “miners’ sunshine,” the safest material for 
burning in miners’ lamps ; vaseline products, such as cerates, 
pomades, soaps and face paints. 
Case 20. — Special grades of illuminating oils. These oils 
are designed to give the best light obtainable under the laws of 
each State. They are liquids of remarkable purity and brilliancy, 
the two finest — Pratt’s Astral and Eocene — ^being hardly distin- 
guishable from distilled water in color. 
Case 21. — High test illuminating oils. 
Case 22. — Illustrations of some of the varied uses to which 
petroleum products can be put. These include waxed paper for 
wrapping purposes, water proof coating for explosives, varnishes, 
wood stains and fillers, rubber cements, electric light carbons, etc. 
