and Magazine of the Ceylon Agricultural Society.— November, 1912. 403 



structure 5 meters long, 2'3 meters wideand 2 - 3m. 

 high and a wooden superstructure. The lower 

 part is the heating-room. The fire lies heaped up 

 near one of the shorter sides. The fire-grate slopes 

 somewhat from front to back. The heat goes off 

 into a masonry canal which runs obliquely along 

 the floor to the centre of the room to about f of 

 the latter's length. Where the canal ends it is 

 connected with a vertical pipe of the shape given 

 below, so long that its top lies some 70 cm above 

 the floor of the beating-room. 



View op Heating-room Looking Downwards. 



V Masonry D Flue. 



B Chimney. E Heat-Canal and Masonry, 



C Heating-pipes. F Passage of hot air from 



canal into pipei. 



Q q 1) 



Connection between Heat 

 This short connecting tube runs into the sys- 

 tem-proper of horizontal pipes. This latter con- 

 sists of two pipes which run parallel to the longer 

 walls, have a diameter of about 30 cm. and are 

 connected by a transverse pipe. The hot air as- 

 cends from the masonry canal, rising vertically, 

 into the long-pipe, passes through this and the 

 connecting tube into the second long-pipe and 



canal and Heating-pipe. 



through this again into the chimney which is 12 

 meters high. 



The three other ends of the pipes open out- 

 wards through the walls, are generally stopped 

 with clay and are opened only for the purpose of 

 being cleaned. Sometimes there are three pipes 

 especially when there are three compartments 

 with trays above. The pipe system lies about 

 1-3 m. under the upper ledge of the walled room. 



A. 



Chimney, 



a 



Masonry supports of the superstructure. 



B 



Copra-trays (18 one above the other.) 



H 



Stone substructure of the heating-room; 



C 



Wooden floor of the upper story with copra thereon. 



J 



Ends of the heating-pipes. 



I) 



Wooden chamber for the trays. 



K 



Furnace. 



E 



Partition wall. 



L 



Stairs leading to upper part. 



V 



Outer walls of the superstructure (Boards). 





The heating-room is covered with iron bars over 

 which is laid wire-netting which thus become 

 the floor of the drying-house. This room for 

 the trays whose ground-plan is a little larger 

 than the heating-room is so high that about 18 

 trays can stand over one another. It is a big 

 box with wooden walk which has ventilation 



holes opening upwards. Inside it is divided by 

 walls into two or three compartments into which 

 the trays just manage to pass. The latter are 

 about 1 m. long and 50 cm. wide. On one side 

 of the box there are as many doors as compart- 

 ments. Fresh copra is every morning spread 

 out on the tray a which are then pushed into the 



