What is one of the themes of the novel Around the World in Eighty Days?
"Modern physics, applied to a practical situation, saves the day." Technology was fascinating to the 19C, especially after the display of it at Prince Albert's glass museum during the mid-century's "Great Exhibition." See enotes excellent discussion of themes in the novel at the site below.
Speed and accuracy are also themes in this novel. In the end, Fogg brings back with him, not only the love of a woman, but the promise of what science will bring, and his mission to set out to prove it. Speed, of course, is meant by the accomplishments in technology.