Burning Lime, and Limekilns. 



403 



coal is dear this will probably be found a valuable improve- 

 ment ; but with some descriptions of coal it is impracticable, 

 and in all cases the labour will be considerably increased. 



The side walls of 

 this kiln (« a) are four * * ^ 



feet thick ; the iron 

 bars at the bottom 

 (b b) are drawn out 

 when the kiln is to be 

 emptied. The lime- 

 stone is raised in a 

 box (d), by means of a 

 jib and crane(e); when 

 raised the jib is swung 

 round, and the lime- 

 box tilted, by which 

 the whole contents 

 are thrown down the 

 shaft. The coke ovens 

 iff) may be two, or 

 a greater or less num- 

 ber, according to the 

 magnitude of the 

 works. They are 

 supplied with coal 

 through iron doors, 

 which doors have a 

 long and narrow hori- 

 zontal opening in the 

 upper part of them, to 

 admit sufficient atmo- 

 spheric air to produce 

 combustion in the in- 

 flammable part of the 

 coal. The flames thus 

 produced pass into the 

 lime shaft, and the 

 flues (g g) are pre- 

 vented from interfer- 

 ing with each other by 

 a partition wall (k). 

 When the kiln is 

 charged the openings 

 in front and beneath 

 the iron bars (i i) are 

 closed, as are certain 

 openings made in the shaft (k) and in the coke ovens (/), at convenient 

 distances, for the purpose of introducing iron bars as pokers, to accelerate 

 the process. When the coal is reduced to coke, it is taken out by a long- 

 handled iron hoe. 



In the Mechanics' Magazine (vol. vii. p. 177, 178.) are 

 figures and a description of a Yorkshire limekiln (said to 

 be a very good one), for burning lime with coal or coke. 

 <( Bottom part, where the lime is drawn out, a circle of about 



D D 2 



