38 BULLETIN 229, U. S. DEPARTMENT OF AGRICULTURE. 



DISTILLATION BY STEAM. 



Of the 200 stills producing turpentine and rosin in France, only 

 about 30 use steam. Several types of steam apparatus are employed, 

 but the Dorian still will serve as an example of the stills heated by 

 steam only. 



This still is remarkable in its simplicity, compactness, and efficiency. 

 Its principal advantage lies in the fuel economy obtained by return- 

 ing directly to the boiler the condensed water obtained from the 

 steam used in heating the still, instead of allowing it to flow away as 

 a complete loss or running it into a tank for feeding the boilers. 



The apparatus (fig. 7) consists of a steam generator, still, and 

 condenser. The generator A, which may be of any type, feeds the 



