An ivory barrel compendium of six main segments screwed together: (1) Pierced end of barrel with 28 holes. (2) An ivory cap with an open slit in its center. (3) A cylindrical with one open end that screws into the above pierced pieces and creates a chamber about 3.0 cm deep. (4) Turned ivory spacer, open at both ends. (5) Compass box with floating, polychrome compass card bearing German initials for cardinal points.
