338 MANURES. 21. 



1. Buildins: the kiln. 



2. Raifing and breaking the (lones. 



3. Coals and their proportion. 



4. Filling the kiln. 



5. Drawing the kiln, 



I. T'be kiln. The materials are either llme- 

 {lone entirely, or limeftone lined with bricks 

 on the infidc. Neither timber nor mortar 

 ought to be ufcd in building a lime-kiln ; the 

 former prefently decays, and the latter by 

 alternately fvvclling and flirinking burfts the 

 walls -, befides rendering them in the firft in- 

 flance too tight to admit a proper quantity 

 of air : no other air-holes than the " eyes '* 

 at whxh they are kindled being made in the 

 kilns of this Diftrid. 



The form 01 the cavity is an irregular cone 

 inverted. At the bottom are generally two 

 eyes oppofitc to each other ; the cavity being 

 here contracted to a thin point, or narrow 

 irongh ; the width that of the eyes. As the 

 vv.dls are carried up, the cavity takes by de- 

 gi CCS a circular, or fometimes an ov<il line ; 

 ill the fatiie time receiving, as it riles, a co- 

 «:i-a!fovm; until having reached fomewhat 



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