backsight

 : 
Noun
 : 
back=sight

CIDE DICTIONARY

backsightn. [Back, adv. + sight.].
     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.  [1913 Webster]

OXFORD DICTIONARY

backsight, n.
1 the sight of a rifle etc. that is nearer the stock.
2 Surveying a sight or reading taken backwards or towards the point of starting.


For further exploring for "backsight" in Webster Dictionary Online


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