MITCHELL; R. J.; ????-???? (about 1850); GBR?

Assistant of Lord Rosse III at Birr Castle, he participated in the discoveries made before 1861 ("Observations of Nebulae and Clusters of Stars made with the 6-foot and 3-foot Reflectors at Birr Castle from 1848 to 1878", Dublin 1880 from the Scient. Trans. R. Dubl. Soc., vol. ii.) along with the Stoneys.