Details
A late 19th Century vernier octant
the brass frame signed on the arc F.M. Moore, Dublin & Belfast and numbered 1518, the inlaid ivory scale divided 5°- 0°- 120°, vernier with fine-screw adjustment and swivel magnifier, seven shades, two mirrors and mahogany handle, the arc -- 8½in. (22cm.)
See illustration
the brass frame signed on the arc F.M. Moore, Dublin & Belfast and numbered 1518, the inlaid ivory scale divided 5°- 0°- 120°, vernier with fine-screw adjustment and swivel magnifier, seven shades, two mirrors and mahogany handle, the arc -- 8½in. (22cm.)
See illustration