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 CONCEPT EXPLANATION |
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| Alidade spirit level |
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| Spirit level for adjusting the vertical axis of the theodolite. |
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| Axis of collimation |
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| The line which interconnects the optical centre of the objective and the centre of the hair cross. |
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| Collimation deviation |
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| The perpendicularity deviation of the collimation line of the telescope from the horizontal axis. |
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| Collimator |
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| Telescope adjusted horizontal to the infinity. The cross hair is enlighted from the ocular-side with diffused light. |
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| Compensator |
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| Optical-mechanical part in the telescope, which makes the collimation line (optical axis) through the gravitation strength horizontal (in the compensation range). Breitling Replica |
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| Crosswise standing |
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| By instruments with bubbles the optical axis of the telescope and the longitudinal axis of the spirit level close horizontal an angle. By instruments with compensator the deviation of the optical axis of the telescope and the axis of the compensator from the square. |
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| Horizontal axis |
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| An axis at right angles to the vertical axis. The binocular of the theodolite turns around it. |
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| Horizontal axis error |
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| The horizontal axis is not at right angles to the vertical axis |
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| Horizontal eccentricity |
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| The eccentricity of the collimation line compared to the vertical axis. |
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| Index compensator |
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| Adjusting device for the reading index of the vertical circle, which compensates the error of the vertical angle measurement caused by the remaining slope of the vertical axis. |
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