SEED-KILNS. 



679 



the cones to pass. The cones are piled a foot deep on the 

 gratings and are stirred constantly so that they part with all 

 their seeds. The seed falls into the seed-chamber on to a 

 paved floor kept cool by the admission of cold air, and from 

 this it is removed. 



This method is adopted by (Fig. 364) Steingasser at Milten- 

 berg, Schultze and Pfeil in Kathenoer, etc. The stove (a) in 

 an underground room, M, the upper part of which leads into 

 a system of pipes (/>, b) and is sur- 

 rounded by a cupolaed frame of trachyte 

 which passes into the seed-room .1, and 

 allows the contained hot air to escape 

 through several long tubes (/.-, k) and 

 numerous openings. The channel (m) 

 admits cool air and (<>, <>) are ventilating 

 tubes arranged so as to keep the paved 

 floor cool. B, C, and D are drying- 

 chambers. 



(c) Drum-sieves. Apparatus with 

 drum-sieves differ completely from 

 those described above, and are used 

 in many places in Silesia, Hanover, 

 Mecklenburg, etc. (Fig. 365). 



Then the hot air is supplied by 

 means of closed pipes (m, m, in) made 

 of trachyte and closed with iron valves, 

 which are situated beneath the drying- 

 chamber. The heating is by stoves 



(o, o, o), that opens into (m, m) ; the vapour escapes by the 

 chimney (k). The cones are supplied from the floor of a 

 loft B, passing through the funnels (a, a) into the drums 

 (/>, I), which revolve in pairs on a common axle; they are 

 turned by handles in the room C so that the seeds may fall 

 through as soon as the cones have opened. The drum-sieves 

 are of wood, or iron, in the former case with wooden gratings 

 secured by several iron hoops. Each drum can be opened 

 (Fig. 366) in order to insert and remove the cones ; under 

 each pair of drum-sieves is a masonry or concrete trench (p) 

 into which the seed falls, and from which it is removed by 



