South Carolina Phosphates. a Lecture Delivered Before the Agricultural Society of South Carolina, Charleston, S.C., December 12, 1879
The book South Carolina Phosphates. a Lecture Delivered Before the Agricultural Society of South Carolina, Charleston, S.C., December 12, 1879 was written by author Charles Upham Shepard Here you can read free online of South Carolina Phosphates. a Lecture Delivered Before the Agricultural Society of South Carolina, Charleston, S.C., December 12, 1879 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is South Carolina Phosphates. a Lecture Delivered Before the Agricultural Society of South Carolina, Charleston, S.C., December 12, 1879 a good or bad book?
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These powerful machines work best in about twelve feet of water, but have been employed in double that depth. Their strength is adequate to tear up the thickest and hardest phosphate beds. Under favorable circumstances, they can daily raise one hundred tons of rock. The "dipper" of the dredging machine empties its load of rock, marl, mud and sand on a grating, or into a preliminary conical "washer," where it is subjected to a heavy stream of 15 water, ^^■hich carries off the t^reater part of th...e mud and sand, thereby enabHng the operatives to detect any pieces of marl, sandstone or oyster shells that maybe mixed with the rock. These are picked out and cast aside. The partially cleaned rock then falls, or is cast by machinery, into a " crusher," and thence into the second " washer," where the fragments are thoroughly cleansed from remaining impurities. The washing apparatus employed in the preparation of the river rock consists of either upright and cauldron-shaped, or the "shaft" washers previously described.
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