This is steampunk turned inside-out. In the early 1960s, illustrator Peter P. Plascencia wanted to bring Jules Verne's ninteenth century visions to life for a Space Age audience. So he trimmed all the curlicues off, de-bronzed everything, and gave us these very Mad Men-looking pictures of a Verne adventure.
Thanks to illustrator Ward Jenkins, who scanned these images in from a 1964 book called Jules Verne: The Man Who Invented the Future, written by Franz Born and illustrated by Peter P. Plasencia.
We've got a gallery.
You can see more on Ward Jenkin's site.