It was of course impossible to measure the distance traversed during the invisibility of the Earth, but I reckoned that I had made above 500 miles between 1h.

Wallace had faded into complete invisibility at the time when she fell in love with Captain Burch and quarreled with her father about him.

It vibrated to invisibility for an instant, then parted with a sound as loud as the fall of the whip.

Invisibility to an enemy may facilitate attack, but it has to be dearly paid for in diminished safety.