“vernier sextant”的概念、定义、翻译、参考文献-科学参考

单词	vernier sextant
释义	vernier sextant [`vǝr·nē·ǝr `sek·stǝnt] ^NAVIGATION A marine sextant providing a precise reading by means of a vernier used directly with the arc, and having either a clamp screw or an endless tangent screw for controlling the position of the index arm.
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