Book, "A description of an astronomical instrument, being the orrery reduc'd : which shews the use of it so far as relates to the motion of the Earth and Moon, explain'd to the meanest capacity, made either in silver, brass or wood.", by Thomas Wright and published by Thomas Wright, London, c.1720. Located at the Science Museum Library at Wroughton. Shelfmark: O.B. WRI WRIGHT. Astronomy book by Thomas Wright 1718-1722