Details
A three circle vernier sextant
the oxcidised brass frame with polished brass arc signed J. Coombes, Optician & Instrument Maker Devanport, the silvered inlaid scale divided 5°- 0°- 160°, swivel magnifier to vernier, fine tangent screw adjustment, seven shades, two mirrors, telescope with wooden handle in fitted box with accessories with test certificate dated 1911 in lid -- 9½ x 10in. (24 x 25.5cm.)
See illustration
the oxcidised brass frame with polished brass arc signed J. Coombes, Optician & Instrument Maker Devanport, the silvered inlaid scale divided 5°- 0°- 160°, swivel magnifier to vernier, fine tangent screw adjustment, seven shades, two mirrors, telescope with wooden handle in fitted box with accessories with test certificate dated 1911 in lid -- 9½ x 10in. (24 x 25.5cm.)
See illustration