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What Is A Bench Mark?

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enotes | Valedictorian

Posted October 9, 2011 at 4:00 PM via web

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What Is A Bench Mark?

Tagged with and measures, science, time, weights

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fact-finder | Valedictorian

Posted October 10, 2011 at 4:00 PM (Answer #1)

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A bench mark is a permanent, recognizable point that exists at a known elevation (height). It may be an existing object, such as the top of a fire hydrant, or it may be an object specifically placed for measurement purposes, such as a brass plate on top of a concrete post. Surveyors and engineers find the elevation of objects by measuring, through a level telescope, the distance of a point from a preestablished bench mark.

Source: World Book Encyclopedia, vol. 2, p. 247.

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