Abney level

noun
Ab·ney level | \ˈabnē-\

Definition of Abney level 

: a surveying clinometer consisting of a short telescope, bubble tube, and graduated vertical arc used especially for measuring tree heights

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First Known Use of Abney level

1883, in the meaning defined above

History and Etymology for Abney level

after Wm. de Wiveleslie Abney †1920 English scientist

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The first known use of Abney level was in 1883

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