Armillary sphere. Single stem turned stand. Four arms support the horizon ring. Revolves with the top half of the stand. Eight winds named. small movable compass under horizon ring.
The primary sphere consists of eight brass rings. In the centre, there are two movable systems of brass rings connected to two short axes fixed at the North and South ecliptic poles of the primary sphere. These systems represent the orbs of the Sun and the Moon. The larger system (for the Sun) consists of two brass rings, which are fixed perpendicularly to each other. One of the rings is located in the plane of the ecliptic and carries a disc for the Sun. The smaller system (for the Moon) also consists of two brass rings, similarly constructed, now carrying a symbol, which represents the Moon. In the centre, there is a small wooded terrestrial globe, mounted on an equatorial polar axis and connected to two little arcs, which are in turn attached to the two ecliptic axes, so that the poles of the Earth always point to the equatorial poles of the primary sphere.