A brass astrolabe, the mater engraved with zodiac calendar and other scales, the edge with foliate and arabesque decoration, the bridge pierced and similarly decorated, with suspension piece and ring, the four plates engraved for various latitudes, the rete pierced and engraved for various named starts, the rule engraved and divided, with access pin and wedge moulded in the form of a bird -- 8½in.diam.