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https://www.merriam-webster.com/dictionary/Abney%20level
ABNEY LEVEL Definition & Meaning - Merriam-Webster
The meaning of ABNEY LEVEL is a surveying clinometer consisting of a short telescope, bubble tube, and graduated vertical arc used especially for measuring...
abney leveldefinitionmeaningmerriamwebster
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Abney level & Compass
Combination abney level + compass
abney levelcompass