He turned on the current. There was a low, humming purr, which gradually increased to a whine, and the car moved slowly forward. It rolled along the gravel driveway to the road, Tom listening to every sound of the machinery, as a mother listens to the breathing of a child.
"She's moving!" he cried.
"But not much faster than a wheelbarrow," said his father, who sometimes teased his son.
"Wait!" cried the youth.
Tom turned more current into the motor. The purring and humming increased, and the car seemed to leap forward. It was in the road now, and, once assured that the steering apparatus was working well, Tom suddenly turned on much more speed.
So quickly did the electric auto shoot forward that Mr. Damon and Mr. Sharp were jerked back against the cushions of the rear seats.
"Here! What are you doing?" inquired Mr. Sharp.
"I'm going to show you a little speed," answered Tom.
The car was now moving rapidly, and there was a smoothness and lightness to its progress that was absent from a gasolene auto. There was no vibration from the motor. Faster and
