Armillary sphere. 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 pole 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 at the ecliptic poles. One of these rings carries the symbol of the Sun. The smaller system (for the Moon) also consists of two brass rings, similarly constructed, with the symbol of the Moon attached to one of them. In the centre of the sphere, there is a small brass ball representing the Earth, mounted on an equatorial polar axis which is connected to two little arcs. These arcs are attached to the two ecliptic poles in such a way that the poles of the terrestrial sphere are always pointing to the North and South equatorial poles of the primary sphere. For further information about the cartography and construction of this armillary sphere please refer to the related publication, Globes at Greenwich.
Original case of boxwood. Tooled leather outer cover. Inside lined with pink woollen fabric. Consists of two spheres with base fitting together with hooks.