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Using collimator to align instrument observing stand at top of Bilby tower with mark in the ground at a triangulation station. Picture

Using collimator to align instrument observing stand at top of Bilby tower with mark in the ground at a triangulation station.

Using collimator to align instrument observing stand at top of Bilby tower with mark in the ground at a triangulation station.

Author: NOAA

License: Public Domain Mark 1.0 (Public domain)
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Added On
16th October 2015
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