Jack and Hal exchanged swift glances.

There seemed, now, very little need of carrying the investigation further.

CHAPTER XV

ANOTHER TURN AT HARD LUCK

When he could trust himself to speak Hal Hastings addressed the naval officer.

"I think Mr. Benson and myself understand, sir, how it happened that this damage was done. There are extra parts in the repair kit. In twenty minutes, sir, I think we can have the engines running smoothly once more."

The naval officer was wise enough not to press the questioning further just then. Instead, he went on deck.

Working like beavers, and with the assistance of others standing about, Jack and Hal had the piston replaced and all the other parts in place within fifteen minutes. Then, once more, Hal turned on the gasoline, set the ignition, and watched.

The engine ran as smoothly as ever.

"There won't be any more trouble, unless someone is turned loose here with files and a blast lamp," pronounced Hal. Then he and his chum sought the deck, to report to the officer in charge.