THE NAVAL STORES INDUSTRY. 



13 



decomposition products of the rosin. Other conditions being the 

 same, the question of obtaining water-white turpentine and rosin 

 depends largely on the temperature. 1 The introduction of the 

 practice of using water during the distillation increased the yield and 

 quality of the turpentine and resulted in rosin of a lighter color. 



2 I 



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Turpentine begins to boil at about 313° F. 2 and the greater portion 

 of fresh turpentine distills between 317° F. and 324° F. (See fig. 2). 

 If an attempt is made to distill turpentine direct from a gum contain- 



1 It should be borne in mind, however, that it is impossible to make light rosin from scrape and dip from 

 old boxes or when the gum contains large amounts of trash by following the ordinary methods of produc- 

 tion. Seep. 27. 



2 203° F. = 95° C. 302° F. = 150° C. 324° F. = 162° C. 207° F. = 97° C. 313° F. = 156° C. 363° 

 F. = 184° C. 212° F. = 100° C. 317° F. = 158° C. 392° F. = 200° C. 



