7.')! msKING AN1> CLKANINC; CONIFKROUS SEtDS. 



■\Vhei). however, hot air is admitted into the seed-kihi, an iron 

 stove and liot-air pipes are placed in a separate chamber, from 

 which the hot air passes, as required, into the hot chamber 

 bein-,' replaced by the admission of cool air. Most large seed- 

 kilns are made on this principle. As the heating is eft'ected 

 more rapidly the more directly the stove communicates with the 

 air, the apparatus is generally arranged so that the hot chamber 

 is traversed by a long series of hot-air pipes, which only after 

 many convolutions communicate with the chimney of the stove. 



Although all seed-husking establishments more or less follow 

 the above plan, they differ from one another in their heating 

 apparatus, arrangement of the gratings, &c., so that hardly any 

 two of them are alike. They may, however, be arranged in 

 groups, according as the wire -trays are moveable, fixed or 

 cylindrical. 



(a) Moveable trays. — In this cuse, the light wooden frames ot 

 the trays are moveable and not too heavy for a man to lift easily; 

 they are placed pretty close one above the other, generally 

 on supports above the hot chamber. They can thus easily be 

 removed and replaced for changing the cones. Hundreds of 

 these frames are used in large establishments. 



One of the older establishments is at Eberswald (figs. 330, 

 331) : A is the chamber for heating, 7i for drying, C,C for 

 cooling. A is surrounded by thick stone walls ; within it are 

 two iron pipes (/.) which are bent back on themselves, their 

 lower piirts resting on the stove and their upper ends opening 

 into the chimney {j>) and they can be cleaned at [ir). The air 

 in A, heated by these pipes, pours through openings c,c,c which 

 can be closed by valves under the trays (a), the latter being 

 placed above the cooling-chambers (',('. The cool air passes 

 into the chamber A through tubes (o,o). The trays {a,a) rest 

 on supports, and when once the cones are placed on them can be 

 isolated by means of shutters from the action of the hot air 

 except when it comes from below. Between the rows of trays 

 and immediately above the heating-chamber is an open space for 

 workmen, who can thus remove and change the trays. Fresh 

 cones are sui)plied through leather tubes descending from the 

 ceiling on to the trays. 



J^)y constantly stirring the cones with rakes, the seeds are 



