A Practical Treatise on Hydraulic Mining in California: With Description of the Use and Construction of Ditches, Flumes, Wrought-iron Pipes, and Dams; Flow of Water on Heavy Grades, and Its Applicability, Under High Pressure, to Mining

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D. Van Nostrand, 1898 - 307 strani

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Stran 126 - Bloomfield inch can only be considered an assumed rough estimate of discharge in twenty-four hours for one miner's inch. The theoretical velocity, in feet per second, of a fluid flowing into the air, through openings in the bottoms or sides of a vessel or reservoir, the surface level of which is kept constantly at the same height, is equal to that which a heavy body would acquire in falling through a space equal to the depth of the opening below the surface of the fluid, and is expressed as follows...
Stran 3 - ME A Practical Treatise on Hydraulic Mining in California. With Description of the Use and Construction of Ditches, Flumes, Wrought-iron Pipes and Dams; Flow of Water on Heavy Grades, and its Applicability, under High Pressure, to Mining.
Stran 225 - The cross riffle which they make is not excelled by any other form. 2d. Their cheapness under ordinary conditions of timber supply. 3d. The convenience of cleaning up, which can be quickly and cheaply done. This last circumstance is of especial importance, because it is often desirable to collect the gold at frequent intervals, as it is injudicious to expose amalgam collected in the riffles to wear by the gravel running over it for long periods. Experience shows square block riffles to be the best...
Stran 112 - ... tons. It is believed that the structure is sufficiently stable to allow with safety a flood of 16,000 cubic feet of water per second to pass through the wastes and over its crest. The water passing over the dam will fall on bare granite bedrock, and thence flows down a steep gorge.
Stran 226 - ... is washed these are considered preferable on account of their cheapness. At Smartsville they have been found to serve fully as well as the blocks, and are claimed to be cheaper. It must, however, be stated that they are more costly to handle, as longer time is required to clean up and repave the sluices when they are used. In some sections of the State longitudinal riffles are preferred, ie, riffles made of scantling placed lengthwise in the sluice.
Stran 109 - This culvert is built with heavy dry-rubble foundation and walls, and is covered with granite slabs sixteen to eighteen inches thick and six and one-third feet long. Three wrought-iron pipes of No. 12 iron, each eighteen inches in diameter, pass through the water-face of the dam. Their upper mouths are protected by a strainer, formed of two-inch plank, anchored to the bed-rock. A separate valve or gate is placed at the lower end of each pipe ; the water passing through the gates, aggregating a flow...
Stran 45 - There is no doubt but that gold, silver, quicksilver, copper, lead, sulphur and coal mines, are to be found all over California, and it is equally doubtful whether, under their present owners, they will ever be worked.
Stran 124 - ... miner's inch of the Park Canal and Mining Company, in El Dorado County, discharges 1.39* cubic feet of water per minute. The inch of the South Yuba Canal Company...
Stran 54 - ... Slope, the Sierra, the Great California Valley, and the Coast Ranges. This arrangement of the physical features of the State holds good for a length of 400 miles, in the direction of the main axial line, and this division of California is the largest and by far the most important, comprising almost the whole of the agricultural and the greater part of the mining districts, and may be designated as Central California ; that portion to the south of a line drawn at right angles to the main axial...
Stran 163 - TV of an inch thicker than the iron of the pipe, and with a play of ^ of an inch between the inside of the collar and the outside of the pipe : b is the lead, which is run in and then calked tight from both sides ; c is a nipple of No. 9 iron, 6 inches in width, riveted on one end of each pipe by means of six rivets.

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