Survey Instruments and Accessories

NAUTICAL SEXTENT

Gun metal frame , with Circle of 20 cm. radius, marked from 0 to 130 degrees, Direct reading up to 15 minutes  and with Vernier up to 15 seconds. Fitted with magnifying lenses and provided with slow motion tangent screw, with tow telescopic and with four intensity matching glasses,  packed in velvet lined wooden case.

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