ANALYSIS, REFINING, AND COMPOSITION. 



39 



HEADS. 



Although the difference in odor between the heads and the hearts 

 was quite noticeable, they did not show any great difference in other 

 properties; the odor of the first 10 per cent of the heads was also 

 somewhat different from the rest of the fractions. The amount of 

 material present in these heads with properties different from the 

 main part of the turpentine (hearts) is therefore very small in pro- 



160* 165* 170* 175 180* 185 I9O* 193' 

 O.B6 7 KB .89 .90 .91 .92 .93, 

 1468 \A70 \A7Z U74 U76 U78 U8O 



FIG. 28. Boiling point, specific 

 gravity, and index of refraction 

 curves for " hearts " obtained in 

 relJning of crude turpentine No. 2. 



TE MPE 



185 190 195 200 205' 210" 

 OJB6 7 SB .89 .90 .91 

 ei474 U76M78 U80 L482 1484 



FIG. 29. Boiling point, specific 

 gravity, and index of refraction 

 curves for " tails" obtained in 

 refining crude turpentine No. 2. 



portion to the original crude, so small that it is impracticable and 

 really unnecessary to separate it. 



HEARTS. 



The hearts contain only about 3.5 per cent of heavy material, and 

 the gravity of this portion is only slightly greater tnan that of the 

 main part of the hearts, the gravities being 0.885 and 0.863, respec- 

 tively, which shows a very satisfactory separation of hearts and 

 tails. 



