"I guess you're going to say I haven't any storage battery, dad," interrupted Mr. Swift's son. "Well, I haven't yet, but I'm going to have one. I've been working on--" "Oh, ho!" exclaimed the aged inventor with a laugh. "So that's what you've been tinkering over these last few weeks, eh, Tom? I suspected it was some new invention, but I didn't suppose it was that. Well, how are you coming on with it?" "Pretty good, I think. I've got a new idea for a battery, and I made an experimental one. I gave it some pretty severe tests, and it worked fine." "But you haven't tried it out in a car yet, over rough roads, and under severe conditions have you?" "No, I haven't had a chance. In fact, when I invented the battery I had no idea of using it on a car I thought it might answer for commercial purposes, or for storing a current generated by windmills. But when I read that account in the papers of the Touring Club, offering a prize for the best electric car, it occurred to me that I might put my battery into an auto, and win." "Hum," remarked Mr. Swift musingly. "I don't take much stock in electric autos, Tom. Gasolene seems to be the best, or perhaps steam, generated by gasolene. I'm afraid you'll be disappointed. All the electric runabouts I ever saw, while they were very nice cars, didn't seem able to go so very fast, or very far." "That's true, but it's because they didn't have the right kind of a battery. You know an electric locomotive can make pretty good speed, Dad. Over a hundred miles an hour in tests." "Yes, but they don't run by storage batteries. They have a third rail, and powerful motors," and Mr. Swift looked quizzically at his son. He loved to argue with him, for he said it made Tom think, and often the two would thus thresh out some knotty point of an invention, to the interests of both. "Of course, Dad, there is a good deal of theory in what I'm thinking of," the lad admitted. "But it does seem to me that if you put the right kind of a battery into an automobile, it could scoot along pretty lively. Look what speed a trolley car can make." "Yes, Tom, but there again they get their power from an overhead wire." "Some of them don't. There's a new storage battery been invented by a New Jersey man, which does as well as the third rail or the overhead wire. It was after reading about his battery that I thought of a plan for mine. It isn't anything like his; perhaps not as good in some ways, but, for what I want, it is better in some respects, I think. For one thing it can be recharged very quickly." "Now Tom, look here," said Mr. Swift earnestly, laying aside his papers, and coming over to where his son sat. "You know I never interfere with your inventions. In fact, the more you think of the better I like it. The airship you helped build certainly did all that could be desired, and--"