Archive image from page 138 of De re metallica (1950). De re metallica deremetallica50agri Year: 1950 BOOK V. 103 divide it obliquely ; howcviT, my discourse is now concerned mainly with vena pro/ioulu, but most of all with the metallic material which it contains. Three vertical shafts, of which the first, A, does not reach the tunnel ; the SECOND, B, reaches THE TUNNEL ; TO THE THIRD, C, THE TUNNEL HAS NOT YET BEEN DRIVEN. D—Tunnel.

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