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 CONCEPT EXPLANATION |
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| Index failure |
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| Failure caused by the unadjustment of the index spirit level or index compensator. |
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| Index spirit level |
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| Adjusting device for the reading index of the vertical circle. |
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| Level trier |
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| Device for measuring of the sensitivity of the spirit levels. |
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| Run error |
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| Magnification failure of the circle reading device. |
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| Slope horizon |
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| If the compensator overcompensates the levelling of the telescope, the instrument aligns a slope horizon. |
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| Slope of the collimation line |
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| In case of an instrument with spirit levels the to the vertical plane projected angle between the optical axis of the telescope and the longitudinal axis of the spirit level. In case of an instrument with compensator the deviation of the collimation line from the horizontal line after the adjusting the vertical axis. |
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| Spirit level constant |
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| Change of the tilt angle for one scale (2 mm). |
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| Spirit level sensitivity |
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| Change of the tilt angle, at that the bubble moves. |
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| Telescope bubble |
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| Spirit level for adjusting the telescope. |
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