| 1. | He created a design with three index arms and verniers.
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| 2. | He placed an " index mirror " on the index arm.
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| 3. | On the index arm, the index mirror ( A ) rotated with the arm.
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| 4. | Moving the index arm allowed the navigator to see any object within 90?of the direct view.
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| 5. | Move the index arm so that the index's spirit level shows the arm is precisely horizontal.
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| 6. | Move the index arm so that the shield's horizontal tube indicates that the shield is precisely vertical.
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| 7. | Lhashi ( 2008 ) further explains that : " Its backside was made as a quadrant with a plumb and an index arm.
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| 8. | Set the label so that the sun's image is projected on the shield at the hole with the index arm roughly horizontal.
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| 9. | When the index arm moves by an angle, say 20? the angle between the fixed ray and the normal also increases by 20?
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| 10. | By moving the index arm, the index mirror can be made to reveal any object up to 90?from the direct line of sight.
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