It's telling that Jules Verne chose the name 'Robert' for his conqueror: Those were definitely more innocent times. I don't know, maybe the name Bob sounds threatening to a guy called Jules. I've always been a fan of early science fiction Illustration, and these are some of the best. Their extrapolation of what was current technology is really quaint in hindsight.
These images are from the Smithsonian's vaults. Read more here
More images from this publication, including the beautiful book binding, can be seen here