Marcus Rowland, the author of The Complete Canal
Priests Of Mars, went on to create an extensive line
of adventure settings based on scientific romances,
the Victorian and Edwardian precursors to science
fiction. They contain plenty of material that could be
very useful in a Space 1889 campaign.
Phil and Kaja Foglio's Girl Genius follows the adventures of a budding mad scientist and her adventures through a wildly varied and detailed gaslamp fantasy world where giant robots, huge airship fleets, and a talking cat don't even begin to be the weirdest things you'd encounter.
Although far more over the top than Space 1889 (and I mean that in a good way), Girl Genius provides plenty of inspiration for your budding mad scientist.
You can read Girl Genius as a free webcomic, it is also available in full color print editions.