"There's the battery, dad," he said, pointing to a complicated mechanism in one corner.
"What's that buzzing noise?" asked Mr. Swift.
"That's the little motor I run from the new cells. Look here," and Tom switched on an electric light above the experimental battery, from which he hoped so much. It consisted of a steel can, about the size of the square gallon tin in which maple syrup comes, and from it ran two wires which were attached to a small motor that was industriously whirring away. Tom looked at a registering gauge connected with it.
"That's pretty good," remarked the young inventor.
"What is it, Tom?" and his father peered about the shop.
"Why this motor has run an equivalent of two hundred miles on one charging of the battery! That's much better than I expected. I thought if I got a hundred out of it I'd be doing well. Dad, I believe, after I improve my battery a bit, that I'll have the very thing I want! I'll install a set of them in a car, and it will go like the wind. I'll"
Tom's enthusiastic remarks were suddenly interrupted by a low, rumbling sound.
