. De re metallica. Metallurgy; Mineral industries. BOOK VI. 209 closed. The bellows, by the first method, blows fresh air into the conduit through its nozzle, and by the second method blows out through the nozzle the hcav}' and pestilential vapours which have been collected. In this latter case fresh air enters through the larger part of the shaft, and the miners getting the benefit of it can sustain their toil. A certain smaller part of the shaft which forms a kind of estuarj', requires to be partitioned off from the other larger part by uninterrupted lagging, which reaches from the top of th
. De re metallica. Metallurgy; Mineral industries. BOOK VI. 209 closed. The bellows, by the first method, blows fresh air into the conduit through its nozzle, and by the second method blows out through the nozzle the hcav}' and pestilential vapours which have been collected. In this latter case fresh air enters through the larger part of the shaft, and the miners getting the benefit of it can sustain their toil. A certain smaller part of the shaft which forms a kind of estuarj', requires to be partitioned off from the other larger part by uninterrupted lagging, which reaches from the top of the shaft to the bottom ; through this part the long but narrow conduit reaches down nearly to the bottom of the shaft. When no shaft has been sunk to such depth as to meet a tunnel driven far into a mountain, these machines should be built in such a manner that the workman can move them about. Close by the drains of the tunnel through which the water flows away, wooden pipes should be placed and joined tightly together in such a manner that they can hold the air ; these should reach from the mouth of the tunnel to its furthest end. At the mouth of the tunnel the bellows should be so placed that through its nozzle it can blow its accumulated blasts into the pipes or the conduit ; since one blast. A—Tunnel. B—Pipe. C—Nozzle of double Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Agricola, Georg, 1494-1555; Hoover, Herbert, 1874-1964. New York, Dover Publications
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