The Nautilus is the amazing submarine created by Captain Nemo of Twenty Thousand Leagues Under the Sea and The Mysterious Island. Jules Verne was incredibly creative in imagining this underwater craft, and is a prime example of steampunk technology becoming somewhat prophetic.
Verne was one of my first introductions to the world of steampunk literature when I was a kid. And I love the idea of a steampunk submarine, that I had to include one in my forthcoming novel, Dragonfly Warrior.
Here are some specifications of this marvel, based on Verne's books:
1) The Nautilus measures 70 meters long, and 8 meters wide. It's tapered on both ends (like a cigar)
2) Its powered by sodium - mercury batteries, and the submarine gathered the sodium straight from the seawater.
3) The cabin behind Captain Nemo's room was called the salon. It contained an organ, a rare art collection, a fountain, and two large oblong windows
4) The library, directly behind the salon, contained 12,000 books
5) It comes up for air like a whale, and its dive time is about 5 days
7) The dinghy is a kind of skiff, or small boat that could be launched from the Nautilus to be used as an escape boat
8) The Nautilus didn't shoot torpedoes from tubes, but it did have a power ramming prow