bavarikon4UDescription
The octant's frame and alidade are made of rosewood (possibly also mahogany), the inlaid reference circle is made of Indian boxwood. All other parts are made of brass. The reference circle is divided from 0° to 90° in intervals of 20'. It is 900 mm in diameter. Two minutes can be read off directly with the aid of a transverse division. The instrument is set up so that measurements can also be taken with the sun behind you. The three retractable filters can be repositioned for this purpose. The measurement results are noted on the ivory board using the pencil in the centre bar.