John Dryer (c.1800 - ):
John Dryer, who was Danish, came to work at Armagh Observatory in 1882. His special interest was nebulae and star clusters, and he had already published on the subject. He was author of a second Armagh catalogue of stars and was requested by the Royal Astronomical Council to publish a comprehensive book which would include his own and Herschel's information. The seminal text New General Catalogue of Nebulae and Star Clusters is still used by astronomers throughout the world.