A New and Accurate History of South America Volume 1

A New and Accurate History of South America Volume 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1756 edition. Excerpt: ...in the ingenios reales, or royal engines, consisting of hammers, or pounders, like the French plaister-mills. They have generally a wheel, about twenty-five or thirty feet diameter, whose long axle-tree is set with smooth triangles, which, as they turn, hook, or lay hold of, the iron hammers, and lift them upto a certain elevation, from whence they drop at once at every turn; weighing about two hundred pounds, and falling so violently, that they reduce the hardest stones to powder: after which, that powder is lifted through iron or copper sieves, to take away the finest, and return the rest to the millj 5 7 p WHEN the ore happens to be mixed with some metals, which obstruct its falling to powder, they calcine it in an oven, and pound it over again. In the little mines, where they use none but mills 'with grindstones, they generally grind the ore with water, which makes a liquid mud, that runs into a receiver: whereas, when it is ground dry, it must be afterwards steeped, and well moulded together with the feet, for aconsiderable time; for which purpose, they make a floor, where they dispose that mud in square parcels, about a foot thick, each of them containing half a caxon or chest, that is twenty-five quintals, or hundred weight of ore; and these they call cuerpos, or bodies. On each of them, they throw about two hundred weight of A of sea or common salt, more or less, according to the nature of the ore, which they mould and incorporate with the earth, for two or three days 4 when they add to it a certain quantity of quicklilver, by squeezing a purse made of a skin, wherein they put it to make it fall in drops, with which they sprinkle the mass equally, according to the nature and quality of the ore; allowing, to each mass, ten, ...show more

Product details

  • Paperback | 136 pages
  • 189 x 246 x 7mm | 254g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236893441
  • 9781236893444