21. YORKSHIRE. 343 



If the contents be drawn out at the bottom 

 while the upper partis yet on fire, the vacancy 

 at the top being repeatedly filled up with 

 flone and coal, as the lime is extraflcd at 

 the botrom, the kiln is termed a " draw 



KILN." 



Since coals have been ufed in the burning 

 of lime, draw kilns have, until of larc years, 

 been molt prevalent. But at prefent fland- 

 inp- kilns are moft in ufe. 



The reafons given for this change of prac- 

 tice are thefe : firft, that the lime is burnt 

 evener in {landing than in draw kilns ; in the 

 drawing of which the ftones are liable to 

 hang round the fides of the kiln ; thofe in 

 the middle running down in the form of a 

 tunnel ; thereby mixing the raw with the 

 half-burnt flones. The confequence is, the 

 outfide are burnt too much, the infide too 

 little J the fiones too frequently running 

 down to the eye in a half-burnt flate. Se- 

 condly, the uncvenncfs of furfaceleft by this 

 method, together with the obfcurity caufed 

 by the fmoke, render tho: filing difficult ; un- 

 der-burnt ftones, or an unnecefliary wafte of 

 coals, is the inevitable confequence. A third 

 Z 4 argument 



