stadia wires

stadia wires

[′stād·ē·ə ‚wīrz]
(engineering)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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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.