BOOK VIII. 



177 



A— Iron plates full of holes. B — Walls. C — Plate on which ore is placed. 

 D — Burning charcoal placed on the ore. E — Pots. F — Furnace. G — Middle 



PART OF UPPER CHAMBER. H — THE OTHER TWO COMPARTMENTS. I — DIVISIONS OF THE 

 LOWER CHAMBER. K — MIDDLE WALL. L — POTS WHICH ARE FILLED WITH ORE. M — LiDS 



OF SAME POTS. N — GRATING. 



