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Which of horizontal hairs are equivalent in stadia diaphragm of tacheometer?

Which of horizontal hairs are equivalent in stadia diaphragm of tacheometer? Correct Answer Upper and lower

The stadia diaphragm has three horizontal hairs viz., a central horizontal hair and upper and lower stadia hairs. The upper and lower stadia hairs are equidistant from the central horizontal hair. Stadia hairs are sometimes called stadia lines.

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