Larklight, Starcross, and Mothstorm, a trilogy of rattling yarns by Mr. Philip Reeve, Purveyor of Scientific Romances to the Discerning Gentry, and Illuminated Throughout by Mr. David Wyatt. They are of the type called "ripping yarns," set in an alternate universe in which America never broke away from the UK because the UK had all the steampunk technology (read, magic with gears and bolts, plus a little alchemy), and the culture is frozen somewhere around 1840. There is an engraving-quality drawing on almost every page. The copyright page has a note at the bottom: "This book was written with the aid of a Snagsby & Co. Patent Lexicological Engine."
These are officially intended for middle grades (ages possibly 11 to 13?), but the writing is deliberately stylized and somewhat arch if not camp, so I think the real audience is adults who enjoy deliberately silly stories in over-the-top writing style. The plot is silly enough to be fun and impossible to take seriously. Think of it as a written cartoon. The "Larklight" itself is a sort of Georgian-style house that happens to be in orbit around the moon, with air pressure and gravity generators provided by the finest steampunk machinery, and air cleaned by hoverhogs which swoop through the air and filter it as they fly.