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細節
A mid 19th Century ebony and brass 8in. radius vernier sextant, unsigned
with inset ivory scale divided 5°- 0°- 140°, vernier clamp and fine screw adjustment, swivel magnifier, sighting tube, seven shades, two mirrors and mahogany handle, contained within fitted keystone box with securing hooks -- 13½in. (34.3cm.) dia
See illustration
with inset ivory scale divided 5°- 0°- 140°, vernier clamp and fine screw adjustment, swivel magnifier, sighting tube, seven shades, two mirrors and mahogany handle, contained within fitted keystone box with securing hooks -- 13½in. (34.3cm.) dia
See illustration