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double sextant |
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double sextant [¦dəb·əl ′sek·stənt] (navigation) A sextant designed to enable the observer to measure simultaneously the left and right horizontal sextant angles of a three-point problem; this sextant differs from a standard sextant in that it comprises a circle with two indices inscribed and two coaxial index mirrors; the horizon glass is silvered top and bottom but is clear in the middle to permit direct observation of the center object ashore. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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