It was at the three hundred and fiftieth mile that Tom had another blow-out. This time it took a little longer to change the wheel, and the red and green cars gained a full lap on him. The track was now so dusty that it was difficult to see the contesting cars. Many had dropped out, and more were on the verge of giving up.
With the odds against him, Tom started in to regain the lost ground. Narrowly he watched his electric power. Slowly he saw it dropping. Would he have enough left to finish out the race? He feared not. The hours were passing. Still there was a hundred miles yet to go—twenty circuits of the track. Some of the spectators were getting weary and leaving. The band played spasmodically.
Suddenly Tom saw the red car shoot to one side of the track, toward a charging station. The green car followed.
"That's our cue!" cried the young inventor. "We need a little more 'juice' and now is the time to get it."
The lad ran to the shed where his charging wires were, and they were connected in a trice. He allowed twenty-five minutes for the charging, as he knew with his improved battery he could get enough current in that time to finish the contest. Before the red and green car
