The boys came close and listened.
"I don't hear any knock," said Frank.
They all listened.
"Don't you hear it now?" said Lee, speeding the engine.
"Seems as though I hear something," said Bill, partly to please Lee.
They all listened closely.
Lee commenced to pry about in the engine. "I have it, I think," he exclaimed triumphantly as he took out a small piece of the machinery. Frank motioned Bill one side, and they wandered around the end of the building.
"Don't you feel sort of afraid to let Lee tinker with your car?" he asked with a show of carelessness.
"Not a bit! Dad says he is a born mechanic and he trusts him with all the care of his car. If dad thinks he can fix that, why, I guess it is safe to let him do anything he wants to do with the Swallow."
"Do you ever let anybody else drive the Swallow?" asked Frank. "I wouldn't mind taking it some day if you don't care."