21. YORKSHIRE. 339 



more than half its intended height, the form 

 is changed to cylindrical ; or is fometimes con- 

 tra£ied towards the top. The proportion be- 

 tween the depths and the diameters of thefc 

 kilns is that of the depth being generally 

 about one and a half diameter of the top, 



Thtjize varies from fix to forty chaldrons. 



2. The jlcms. The arc of raifing ftones 

 can only be learned by experience in the gi- 

 ven quarry in which they are to be raifed. 

 They are fometimes raifed by the day; fome- 

 times by the load; but moil generally the 

 entire labour of burning is taken together at 

 fo much a chaldron of lime. 



The breaking of hard, ftrong (lones is a la- 

 borious part of the operation of lim.e-burning. 

 On the north- fide of the Vale it is done by 

 men with large fledge hammers •, but on the 

 Malton fide, where the ftone is foft, women 

 are frequently employed in breaking. 



The medlum^2;i? is that of the two hands ; 

 but men burning by the chaldron will not, 

 unlefs well attended to, break them fo fmall ; 

 (tones nearly as big as the head are fome- 

 times, but very improperly, thrown into the 

 Z 2 kiln J 



