The book De Re Metallica was written by author Georg Agricola Here you can read free online of De Re Metallica book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is De Re Metallica a good or bad book?
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D — Chain. G — Balance drum. but the drum which is round the axle, the chain, and like the first machine. It has much more capacious second machine, but since the dippers are frequently use these machines ; for they prefer to Uft out small the first five machines or to draw it up by suction the stream. B — Axle. E — Link. F — Dippers. the balance drum, are dippers than even the broken, miners rarely quantities of water by pumps, or, if there is 176 BOOK VI. much water, to drain it by the rag an...d chain pump or to bring it up in water-bags. Enough, then, of the first sort of pumps. I will now explain the other, that is the pump which draws, by means of pistons, water which has been raised by suction. Of these there are seven varieties, which though they differ from one another in structure, nevertheless confer the same benefits upon miners, though some to a greater degree than others. The first pump is made as follows. Over the sump is placed a flooring, through which a pipe — or two lengths of pipe, one of which is joined into the other — are let down to the bottom 01 the sump ; they are fastened with pointed iron clamps driven in straight on both sides, so that the pipes may remain fixed.
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