SCOTCH PINE AND SPRUCE SEED. 



757 



removed. The vapour from the cones escapes by means of 

 shafts (d/l) which can be closed if required ; fresh air is supplied 

 by the vent-holes {0,0,0). 



This simple apparatus may be taken as a type of numerous 

 private seed-husking establishments, as Geigle's in Nagold, 

 Steiner's in AViener-Neustadt, &c. The large establishment of 

 Appel, in Darmstadt, is on the same principle. The frames 

 supporting the trays are made of iron ; four large stoves in the 

 lower story supply the hot air. Numerous openings with valves 

 regulate the temperature. 



Fig. 333. 



(b) Fixed trays. — Fixed trays are used in buildings with 

 several stories ; the heating-apparatus being on the ground-floor, 

 above which are two or more drying-chambers. The floor of 

 each of these is of grating (in the newest establishments of the 

 kind, of thick iron wire, in the older ones of wooden bars), but 

 close enough to allow only the seed and not the cones to pass. 

 The cones are piled a foot deep on the gratings and are con- 

 stantly stirred, so that they part with all their seeds. The seed 

 falls into the seed-chamber on to a paved floor kept constantly 

 cool by the admission of cold air, and from which it is removed. 

 In the older establishments of this kind, the floors are not 

 completely covered with gratings, but the gratings are sur- 

 rounded by planked floors and enclosed with planks a foot high. 



Although in this system, the different establishments are not 

 so variable as in those with moveable trays, they differ in their 

 respective heating-apparatus. 



Sometinif s the hot air is distributed by means of masonry 



