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Bench Mark |
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bench mark In surveying, a marked reference point on a permanent, fixed object, such as a metal disk set in concrete, whose elevation (above or below an adopted datum) is known and from which the elevation of other points or objects may be determined. Bench Mark a metal disk 8-10 cm in diameter with a 2-mm hole in the center, set into the outside wall of a stone structure (building, tower, bridge) and indicating a point whose elevation above sea level has been ascertained by leveling. The bench mark also bears a number and the name of the institution or government department doing the leveling. In the USSR, the elevation to the hole in the center of bench marks is determined in relation to the level of the Baltic Sea and is cited in the appropriate catalogs. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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