Cyclopedia of civil engineering; a general reference work on surveying, railroad engineering, structural engineering, roofs and bridges, masonry and ... hydraulic engineering, irrigation, Volume 7 - Tapa blanda
Sinopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...is associated with a special device or instrument by which it is to be actually determined. The form of this apparatus should be in accord with the principles of hydraulics, and be determined by scientific considerations. The inch is such a unit of measurement: it has to be associated with some particular device or instrument of measurement. Its use is as old as irrigation. In this country it is older than modern irrigation, having been first used by the placer miner, and borrowed from him by the irrigator. In both mining and irrigation, it is the volume of water which will flow through an inch-square orifice under a uniform and designated pressure. The slope and size of the orifice and the pressure upon it are fixed by law in a number of States, and in others regulated by custom. "The ruling custom in the United States is to have the orifice through which water is delivered, 6 inches in height, and wide enough to deliver the required number of inches. The pressure on this orifice varies from 4 inches above the center in some places, to 6 inches above the top in others. In Nevada, the inch has sometimes an opening 4 inches in height, with a pressure of 6 inches above the top. Irrigators who are not able to compute the quantity of water flowing over weirs or through flumes, prefer, as a rule, to have their water measured by the inch. They can tell by looking--or believe they can--whether or not the quantity contracted for is being delivered; and when the conditions presented by the statute are complied with, they can tell, with a close approximation to the truth, whether or not they get what they pay for. "The most serious objection to this unit is the name. Men accustomed to square inches and cubic inches, confuse them with miner.s...
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Reseña del editor
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...is associated with a special device or instrument by which it is to be actually determined. The form of this apparatus should be in accord with the principles of hydraulics, and be determined by scientific considerations. The inch is such a unit of measurement: it has to be associated with some particular device or instrument of measurement. Its use is as old as irrigation. In this country it is older than modern irrigation, having been first used by the placer miner, and borrowed from him by the irrigator. In both mining and irrigation, it is the volume of water which will flow through an inch-square orifice under a uniform and designated pressure. The slope and size of the orifice and the pressure upon it are fixed by law in a number of States, and in others regulated by custom. "The ruling custom in the United States is to have the orifice through which water is delivered, 6 inches in height, and wide enough to deliver the required number of inches. The pressure on this orifice varies from 4 inches above the center in some places, to 6 inches above the top in others. In Nevada, the inch has sometimes an opening 4 inches in height, with a pressure of 6 inches above the top. Irrigators who are not able to compute the quantity of water flowing over weirs or through flumes, prefer, as a rule, to have their water measured by the inch. They can tell by looking--or believe they can--whether or not the quantity contracted for is being delivered; and when the conditions presented by the statute are complied with, they can tell, with a close approximation to the truth, whether or not they get what they pay for. "The most serious objection to this unit is the name. Men accustomed to square inches and cubic inches, confuse them with miner.s...
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