Meteorological registers were continuously kept at Markree during thirty years from 1833, many of the results being communicated to the Meteorological Society. In 1844–5 Cooper and Graham made an astronomical tour through France, Germany, and Italy. They brought the great refractor, which was mounted on a wooden stand with altitude and azimuth movements, was usd by Cooper to sketch the Orion nebula. On 7 February 1845 he used it to detect independently at Naples, a comet which had already been observed in the southern hemisphere.
