Brass double-frame sextant. Science Museum Group Collection

Anodized brass sextant, double-frame bridge (straight-bar) type, with polished brass limb and wooden handle, by W Harris and Company, 50 Holborn London, England, 1830-1839. Consists of inlaid 120° silver scale (-5° to 149°) with 10' divisions, gold vernier scale (20") two sets of filter shades (3 & 2, red & green) and reading magnifier on a on a worm screw. Fitted with threaded telescope bracket with collimation correction for two telescopes, 83mm (erect image).

Double Frame Bridge Sextant

Double Frame Bridge Sextant

New Scientific Instruments with Old Dates and Marks

Angle sextant hi-res stock photography and images - Alamy

National Museum of American History

Double Frame Bridge Sextant

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