BOOK XI. 



525 



A— Side walls. B— Front arch. C— Rear arch. D— Wall in the rear arch. 

 E— Inner wall. F— Vent holes. G— Chimney. H— Hearth. I— Tank. K— Pipe. 

 L — Plug. M — Iron door. N — Transverse bars. O — Upright bars. P — Plates. 

 Q— Rings of the bars. R— Chains. S— Rows of bricks. T— Bar. V— Its haft. 



X — Copper bed-plates. 



36 



