Folding sectoral gnomon with latitude selection scale and bird-shape pointer is mounted on the base of compass box. Four hour scales for different latitudes: V-ХII with points in 1/4 hour (40°), 4-12-8 - in 1/2 hour (55°). Latitude selection scale 40°-60° with points in 1° and numbering in 10. List of 27 European cities with thier latitudes is on the bottom of the base. Inscription on hour scale: “N BION А PARIS".