| 1. | The alidade was then aligned with the second object as well.
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| 2. | The rim of the alidade has markings for 360 degrees.
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| 3. | With skill, this sort of alidade can yield very precise measures.
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| 4. | This could be the edge of an alidade or a similar device.
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| 5. | Alidades have been made of wood, ivory, brass and other materials.
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| 6. | The alidade was originally a part of many types of scientific and astronomical instrument.
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| 7. | An alidade can be seen in the lower right illustration of the Persian astrolabe above.
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| 8. | Eventually, the simple, open-sight alidade was replaced with a sighting telescope.
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| 9. | The alidade was free to rotate about a pin through the centre of the instrument.
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| 10. | Observations were typically made with an alidade, though newer versions could use a telescope.
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