... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... The telescope was mounted on 28th July, 1885 and regular work with it began in September 1885, the first programme involving a re-examination of some nebulae which had been suspected of change (see Dreyer, Mon. ... Roy. astr. Soc., ... After 1893, micrometrical measurements of double stars, together with occasional work on phenomena such as the 1895 transit of Mercury were carried out (see Mon. ... Other virtual visits . ...