Abney level

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Abney level

[′ab·nē ′lev·əl]
(engineering)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Abney level

A hand level used for measuring vertical angles; comprised of a small telescope, bubble tube, and graduated vertical arc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.