BOOK XI. 



525 



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

 E — Inner w.all. 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. 



