The bow was sharper than the stern.

The body was of aluminium, the wings of a substance whose nature I could not determine.

The body rested on four wheels, about two feet in diameter.

These had pneumatic tires so thick as to assure ease of movement at any speed.

Their spokes spread out like paddles or battledores; and when the "Terror" moved either on or under the water, they must have increased her pace.
These wheels were not however, the principal propeller.