Armillary sphere. Single stem stand. Horizon ring and four supporting arms, removable. Rings with symbols for the Sun and Moon. Pink/red/white marble Earth in centre on cranked mounting.
The primary sphere consists of eight brass rings, two of which are fixed perpendicularly to each other and represent the colures. Inside the primary sphere, 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 Moon. The larger system (for the Sun) consists of two brass rings fixed perpendicularly to each other. One of these 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, once carrying a now broken-off disc for the Moon. In the centre, there is a small pink, red and white marbled sphere representing the Earth, mounted on an equatorial axis, connected to two ecliptic axes, so that the poles of the central Earth always point to the 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.