Close up of a benchmark, with a surveyor's plumb-bob visible, hanging above. The benchmark acts as a point of reference for any future measurements.

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Size: 3235px × 3437px
Photo credit: © Photo Researchers / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: acts, bench, benchmark, bob, bw, close, future, geological, geology, hanging, history, instrument, line, mark, marks, measure, measurements., plumb, plumb-bob, plumb-line, point, reference, survey, surveying, surveyor, tool, visible, weight