Thanks for this post. I think I've already seen this image in some other books from Ball, I remember the couple at the bottom, but I cannot recall any color reproduction. The whole story of this telescope is probably the finest example when money and dedication to science meets.
I think the color was what made the picture pop for me. I'm big on what might be called "astronomical charm," which is probably part of what attracts me to OLD books.
Lord Rosse was evidently a heck of an engineer, figuring out how to cast and figure the huge speculum metal mirrors. My impression from what I've read is that the mirrors, which had to be changed and polished frequently, at first were superb, giving excellent images. Later, after many years of repolishing, it probably deteriorated somewhat, still showing DSO's better than smaller telescopes, but losing some of it's resolution. It was obviously never good at measuring exact positions, which could occasionally draw some criticism at a time when positional astronomy was for many professionals "what it was all about."