252 BULLETIN 42, UNITED STATES MATIONAL MUSEUM. 



to a very low temperature and subjecting it to pressure. The following 

 table gives the final products: 



Per cent. 



Gasoline 1.0 to 1.5 



" C" naphtha 10.0 



"B" naphtha 2.5 



"A" naphtha "i. to 2.5 



16.5 



Illuminating oil 50. to 54. 



Lubricating oil 17. 5 



Paraffin wax, 4i pounds per barrel 2. 



Loaa 10. 



100.0 



The treatment of petroleum is illustrated b.y a very large collection 

 of 119 specimens, .-vhowinga great profusion of i)roducts, prepared by 

 Mr. T. G. McMasters, Pittsburg, Pennsylvania. 



The collection shows a series of the first distillates obtained, a very 

 complete series of the commercial products obtained by refining these 

 distillates, and some intermediate products. 



The following twenty-seven specimens illustrate the first distillation : 



(1) Benzine, colorless; specific gravity 83^ Bauni<5. (59G02.) 



(2) Benzine, colorless; specific gravity 8C^ Baum6. (59603.) 



(3) Benzine, colorless; specific gravity 70° Baume. (59604.) 



(4) Benzine, colorless ; specific gravity 65° Baum^. (59605.) 



(5) Benzine, colorless; specific gravity 63° Baume. (59J0I5.) 



(6) Distillate, colorless ; specific gravity 60° Bailing. (59607.) 



(7) Distillate, colorless ; siiecific gravity 55° Bauni6. (59608.) 



(8) Distillate, colorless; s]iecific gravity 50° Bauine. (59609.) 



(9) Distillate, colorless ; specific gravity 48° Bauiii^. (59610.) • 



(10) Distillate, nearly colorless; specific gravity 46° Ban me. (59611.) 



(11) Distillate, nearly colorless ; specific gravity 45° Baunie. (5961"<;. ) 



(12) Distillate, nearly colorless; specific gravity 43° Banni6. (59U13.) 



(13) Distillate, light straw color ; specific gravitj' 40° Baiim6. (59514.) 



(14) Distillate, dark greenish red ; specific gravity 38° Baum^. (59615.) 



(15) Paraiiiu distillate, light brown ; specific gravity 42° Bauni^. (59623.) 



(16) Paraffin distillate, dark reil ; specific gravity 38° Bauuie. (.")9()24.) 



(17) Paraffin distillate, dark greenish red ; specific gravity 35° Baiime. (59625.) 



(18) Paraffin distillate, dark greenish red; specific gravity 30° Baume. (.59626.) 



(19) Paraffiii distillate, dark greenish ; specific gravity 29° Bauni6. (59627.) 



(20) Paraffin distillate, dark greenish ; specific gravity 27° Baume. (59628.) 



(21) Paraffin distillate, dark greenish ; specific gravity 25° Baume. (59629.) 



(22) Paraffin distillate, dark greenish ; specific gravity 24 Baume. (59630.) 



(23) Paraffin distillate, dark greenish ; specific gravity 2i° Baum^. (59631.) 



(24) Paraffin distillate, greenish brown; specific gravity 16° Baum6. (59632.) 



(25) Tailings, light brown. (59633.) 



(26) Residuum, still residue, black ; specific gravity 18° Baunid. (59641.) 



(27) Residuum, still residue, black; specific gravity 20° Baume. (59642.) 



The following specimens illustrate various grades of commercial oils : 



(1) Gasoline, colorless; specific gravity 103° Baum6. (59616.) 



(2) Gasoline, colorless ; specific gravity 95° Baum6. (59617.) 



(3) Gasoline, colorle.ss ; specific gravity 88° Baum6. (59618.) 



