Universal ring dial. The dial is suspended from the cord shown in the upper left; the suspension point on the vertical meridian ring can be changed to match the local latitude. The center bar is twisted until a sunray passes through the small hole and falls on the horizontal equatorial ring.
A drum orrery by Harris & Co. circa 1820. The globe is labelled, Lane and Co. Benjamin Martin designed the drum type orrery. The mechanical works of this orrery are housed in a brass drum with a central fixed brass sun and articulated mechanical brass armatures mounted with ivory spheres representing nine orbiting bodies: Mercury, Venus, Earth, Ceres, Mars, Pallas Jupiter, Saturn and Uranus. The Earth, Jupiter, Saturn and Neptune are displayed with their separate orbiting moons..