158 



SEEDING AND PLANTING 



elevated end of the cylinder, and gradually work their way toward 

 the lower end. This type of cone churn is light and can be 

 easily taken apart for transport. In recent years, it is coming into 

 general use even in small operations when the cones are dried by 



Photograph by U. S. Forest Service 



FIG. 28. Removing the seed from dried Douglas fir cones. Apache 

 National Forest. 



solar heat. 1 In the type used at Wyeth, as the cones are brought 

 from the kiln, they are carried by mechanical conveyors to the 

 upper end of the shaker, which is 16 feet long. Instead of being 

 cylindrical it is 2 inches larger in diameter at the exit than at the 

 entrance and the shaft is horizontal. The slope of the sides, due 

 to the difference in diameter of the two ends, causes the cones to 

 work gradually to the exit from where they are carried to the boiler 

 room. 



In the seed-extracting plant at Eberswalde 2 as the opened cones 



1 Cox, W. T.: Reforestation on the national forests. (U. S. Forest Service, 

 Bui. 98. 1911.) 



2 Wiebecke, Forstmeister: Die An wen dung neuen Erkennens und Konnens 

 auf die Kiefernsamendarre. (Zeitschrift f. Forst- u. Jagdwesen, S. 342-360. 

 1910.) 



