A 19th Century ebony octant , by William Mowbray, West Hartlepool , the frame with ivory maker's plaque and scale, pencil, pin-hole sight three shades and mirror, the index arm with vernier and tangent screw adjustment -- I9¾in (24.8 cm) radius, in shaped mahogany case See illustration
A 19th Century ebony octant , by William Mowbray, West Hartlepool , the frame with ivory maker's plaque and scale, pencil, pin-hole sight three shades and mirror, the index arm with vernier and tangent screw adjustment -- I9¾in (24.8 cm) radius, in shaped mahogany case See illustration
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
