Ebony 13-inch Radius Octant by Norris & Co.

Description:

Ebony 13-inch Radius Octant by Norris & Co., London, with bone scale divided 95-0, brass index arm with shaped read-out and clamp, bone finial and plaque, two pinhole sights, reflectors, magnifier and three shades rotated from the underside, on brass feet, (vernier split).
Estimate $400-600

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