Ebony frame with brass index arm and fittings. Tangent screw and clamping screw on the back of the index arm. Three shades (red, red, green); three horizon shades (red, red, green). Index glass adjustment by screw; horizon glass by capstan screws for perpendicularity only. Threaded telescope bracket, no adjustment. Telescope (83 mm) erect image; sight tube (93 mm), shaded eyepiece (red). Adjusting pin and magnifier missing; one foot missing. Fitted keystone mahogany box with blue velvet, 2 latch hooks, lock; inlaid brass blank label on the lid. This octant (A-192) consists of multiple parts, located on shelves 18/1 and 19/4.
Materiaal
Marked on the inlaid ivory plate on the crossbar: "Batenburg & Co Rotterdam"
