Definition of Bench mark
1. Noun. A surveyor's mark on a permanent object of predetermined position and elevation used as a reference point.
Medical Definition of Bench mark
1. A fixed, more or less permanent reference point or object of known elevation, the U.S. Geological Survey (USGS) installs brass caps in bridge abutments or otherwise permanently sets bench marks at convenient locations nationwide, the elevations on these marks are referenced to the National Geodetic Vertical Datum (NGVD), also commonly known as mean sea level (MSL), locations of these bench marks on USGS topographic maps are shown as small triangles, since the marks are sometimes destroyed by construction or vandalism, the existence of any bench mark should be field verified before planning work which relies on a particular reference point, the USGS or local state surveyors office can provide information on the existence, exact location and exact elevation of bench marks. (09 Oct 1997)
Bench Mark Pictures
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Lexicographical Neighbors of Bench Mark
Literary usage of Bench mark
Below you will find example usage of this term as found in modern and/or classical literature:
1. Plane Surveying: A Text-book and Pocket Manual by John Clayton Tracy (1907)
"Bench or Bench-mark. A fixed point of referenca whose elevation with respect ... The elevation of the first bench-mark is sometimes arbitrarily assumed, as, ..."
2. The Principles and Practice of Surveying by Charles Blaney Breed, George Leonard Hosmer (1908)
"When it is desired to establish a bench mark a suitable point is selected and used ... The elevation of this bench mark could be obtained by simply taking a ..."
3. Final Report by New Jersey Geological Survey (1898)
"Bench-mark on oak at north end of bridge over river 5.1 Masonville. Bench-mark on maple, in front of post-office 44.1 Maple Shade station. ..."
4. The Theory and Practice of Surveying: Designed for the Use of Surveyors and by John Butler Johnson (1900)
"In connecting with a bench-mark if the bolt is vertical the fo > rod is placed ... Now bisect the bench-mark with the telescope normal and also inverted, ..."
5. Science by American Association for the Advancement of Science (1886)
"Height of coast and geodetic survey bench-mark 2. This bench-mark was placed at the same level as Metres. at tbe St. Louis bridge above tbe average or half- ..."