Most of Howe's work at the observatory consisted of observations of neglected nebulae from the New General Catalogue, measurements of double stars, and positional work on comets and asteroids.
From 1874 to 1878, J. L. E. Dreyer worked with the telescope and began the compilation of his New General Catalogue of Nebulae and Clusters of Stars.
Copeland discovered thirty-five NGC objects, most of them with Lord Rosse's 72" reflector. Planetary nebulae were found by visual spectroscopy at Dun Echt and during an Andes expedition. Seven of the galaxies in the constellation Leo form the famous "Copeland Septet": NGC 3745, 3746, 3748, 3750, 3751, 3753, and 3754.
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It was compiled by Robert Grant Aitken and published in 1932 in two volumes, under the name New general catalogue of double stars within 120° of the North Pole.