A Sewill ebony octant, with ivory main scale graduated 0°-100°, peep-hole site, adjustable horizon mirror and six shades -- 11in.(28cm.) radius, in shaped wooden case with W.F. Cannon, London retailer's label

Details

A Sewill ebony octant, with ivory main scale graduated 0°-100°, peep-hole site, adjustable horizon mirror and six shades -- 11in.(28cm.) radius, in shaped wooden case with W.F. Cannon, London retailer's label

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