| 21. | If observing a dim object such as a star, the navigator would observe the object directly through the alidade.
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| 22. | The vanes of the alidade were either slotted or pierced with a hole to allow the user to align the alidade.
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| 23. | The vanes of the alidade were either slotted or pierced with a hole to allow the user to align the alidade.
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| 24. | Distances to the objects can be measured directly or by the use of stadia marks in the telescope of the alidade.
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| 25. | If the sextant is permanently fixed in position, only the position of the alidade or similar index need be determined.
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| 26. | His techniques in working the alidade and plane table " contributed notably to the effectiveness of mapping rugged mountain areas ".
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| 27. | In this case, the object is viewed and the alidade is rotated until the two opposite vanes simultaneously eclipse the object.
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| 28. | The alidade is mounted on a post at a height of 5 ft ( 1.524 m ) from the ground.
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| 29. | Geological Survey maps were generally unavailable and early soil surveyors used the plane table and alidade to develop their own base maps.
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| 30. | "' Alidade Lake "'is a small alpine lake in Sawtooth Mountains in the Sawtooth National Recreation Area.
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