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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
To obtain comparable height above sea level of bench marks that would have a minimum deviation from the rest elevations in the state height system the levelling line was connected to the bench marks the height of which above the sea level is defined by the vertical datum Trst.
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