There was a hull of thinly rolled but strongest steel. It was provided with dead eye windows of convenient number, water-tight and provided with slides.
Above the hull was an outer deck provided with a guard rail which extended from stem to stern.
Then above this deck was a cylindrical body with windows, of toughest plate glass, and doors in its ends.
This was the cabin of the Dart, and it was divided into various compartments, which we will describe separately.
In the middle of the cabin cylinder was a section of straight plate glass, so that the travelers sitting in the cabin were in constant view of the sea and its depths.
Two masts rose fore and aft, and forward was a pilot-house where were the nautical apparatus and the steering gear, as well as the electric keyboard.
For the propelling and lighting power of the Dart was furnished by electricity. Over the pilot-house was a most powerful electric searchlight.
With this the bottom of the sea was made as plain as broad daylight, and was a mighty advantage.
This is a meager description of the exterior of the Dart. The interior was magnificent beyond description.
Frank had spared no expense in the fittings of the Dart, so that it was a veritable floating palace.