stadia wires

stadia wires

[′stād·ē·ə ‚wīrz]
(engineering)
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References in periodicals archive ?
In addition to their normal crosshairs, two horizontal stadia wires appear on the upper half of the scope's field of view.
But they aren't really stadia wires because the spaces between them (all of different size) don't correspond to any particular target measure.