 On account of the slight difference in the specific gravity of the gray coal and the bone, the spirals are adjusted so as to retain only the slate and flat sulphur balls, leaving the bone to be removed by hand. The round sulphur balls which on account...  The Mining World - Page 6371908Full view - About this book
 | University of Montana, Montana State University (Missoula) - Building stones - 1908 - 184 pages
...the top of the building. From here the material is handled as in most spiral washers, but on account of the slight difference in the specific gravity of...the first to leave the spirals and go with the coal. 17 also have to be removed by hand. Of 2,000 tons of the mine product which is daily dumped into the... | |
 | Thomas Nelson Dale - Granite - 1908 - 458 pages
...the material is on the chutes. On account of the slight difference in specific gravity of coal and bone, the spirals are adjusted so as to retain only...go with the coal, also have to be removed by hand. The rock elevator, having continuous buckets 12 by 30 inches in size, elevates the impurities into... | |
 | Geological Survey (U.S.) - Geology - 1909 - 118 pages
...the material is on the chutes. On account of the slight difference in specific gravity of coal and bone, the spirals are adjusted so as to retain only...go with the coal, also have to be removed by hand. The rock elevator, having continuous buckets 12 by 30 inches in size, elevates the impurities into... | |
 | Milo Smith Ketchum - Mine buildings - 1912 - 506 pages
...electric lights. It has two stand-pipes with hose connections and hose for fire protection. On account of the slight difference in the specific gravity of...go with the coal, also have to be removed by hand. The results obtained are given below, showing the percentages of refuse in the various sizes: In pea... | |
 | Milo Smith Ketchum - Mine apparatus - 1912 - 508 pages
...connections and hose for fire protection. On account of the slight difference in the specific grav1ty of the gray coal and the bone, the spirals are adjusted...go with the coal, also have to be removed by hand. The results obtained are given below, showing the percentages of refuse in the various sizes : In pea... | |
 | Engineering - 1904 - 544 pages
...electric lights. It has two stand-pipes with hose-connections and hose for fire-protection. On account of the slight difference in the specific gravity of...go with the coal also have to be removed by hand. The results obtained are given below, showing the peicentages of refuse in the various sizes : —... | |
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