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Webster's Unabridged Dictionary:

Back·sight

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n. (băk"sīt`)

[Back, adv. + sight.]
(Surv.) The reading of the leveling staff in its unchanged position when the leveling instrument has been taken to a new position; a sight directed backwards to a station previously occupied. Cf. Foresight, n., 3.

McGraw-Hill Dictionary of Architecture & Construction:

backsight

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In surveying, a sight on a previously established survey point or line.

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Webster's Unabridged Dictionary Webster 1913 Dictionary edited by Patrick J. Cassidy Read more
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McGraw-Hill Dictionary of Architecture & Construction McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved. Read more

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