Davis Instruments Mark 25 Sextant

Item Number: 25
Full-field Beam Converger with quartz hard coat replaces conventional half silvered mirror. Horizon and astrobody images are combined in a single full field for easy, reliable sights under the most difficult conditions. Special mineral coating is selective for different wavelengths of light. Horizon is transmitted in one colour region and the star or sun in another. Improved reinforced plastic stiffens frame for greater measurement accuracy.
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