Photograph of the Dumb-bell Nebula (M27), taken by Isaac...
Photograph of the Dumb-bell Nebula (M27), taken by Isaac Rob
Photograph of the Dumb-bell Nebula (M27), taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 3 hours on 3rd October 1888 at his observatory & home at Maghull, near Liverpool.