For longer distances, special stadia rods are better suited.
2.
Since very fine gradations are not necessary for long sights, they may be left off the dedicated stadia rod.
3.
In order to provide good visibility at long distances, stadia rods are typically wider than levelling rods with larger markings.
4.
The distance between the instrument and a stadia rod can be determined simply by multiplying the measurement between the stadia hairs ( known as the stadia interval ) by 100.
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