“Here's a stream o' water thirty feet wide an' a foot an' a half thick. There's a horse-power in every square foot of it. I'll take off, say, one-quarter o' the fall an' head her into an iron pipe an' let her jump down. She strikes like a triphammer, dropping thirty feet in a big, cast-iron cylinder. There are holes around the bottom of it. The water squirts through 'em with power enough to kick a man's leg off. Now, I'll put a wheel there at the bottom, with a big steel rim that has buckets on it like the slats in a windmill. Well, out come the jets o' water an' give them buckets a cuff that sets the wheel goin'. A shaft on this wheel moves the dynamo, an' there you have it.”
“What?” Mr. McCarthy asked.
“'Lectricity,” was the prompt answer of the Pearl. “Don't you know how it's made? Nor I, neither, but I guess I can come as nigh tellin' as any one. Here's a stationary wheel out by the end o' the shaft with some short bars of iron fastened to the rim of it, an' each bar is wound with a coil o' wire. Now, when ye send a current through the coil, that bar o' iron gets alive. It will take hold o' any other piece o' iron an' hang on like a bulldog. Folk call it a magnet, an' it's some like a boy—never gives any reason for his conduct which nobody understands. It just takes hold, an' that's all there is about it. Now, there's another wheel that moves with the shaft an' has the same number o' bar ends on it, all made o' soft iron but not wrapped with wire. Set these wheels parallel an' close, so the bar ends are not more 'n a quarter of an inch apart. The magnets begin to pull. The power in 'em jumps over that quarter-inch o' open space an' takes hold o' the soft iron. You have to put an awful power on the shaft to stir the one wheel on account o' the cling o' the magnets. It's like pullin' a cat out of a hole backwards. The power begins to spit an' make actions. When you move the wheel an' break the hold o' the magnets the power begins to travel an' chases 'round the rim. It opens the gate o' the great reservoir an' out comes a stream, an' it's 'lectricity. Nobody knows why nor wherefore, an' the magnets keep to work an' say nothin'. It's like churnin' cream till ye get butter. Ye break the pull o' the magnets an' set it whirlin' in a kind of a current, an' you get a power that zips off on a wire at the rate of a hundred and eighty thousand miles in a second. That's 'lectricity. It's rather fractious an' fond o' travel. But ye can coop it up in the wheels an' steer it where ye like. Ye can pen it in with glass an' rubber an' other things just as easy as ye can hold water with a tin pail.”
“You hold it in popper sections, fastened to both wheels, sweep it up with a brush, an' send it off on a wire. I've got a scheme for takin' it from the other end o' the wire in large or small quantities to suit the purchaser, an' I believe that I can move all the wheels in Heartsdale, an' a good many more.”
“If I get along in business maybe I can furnish the capital one o' these days,” said Mr. McCarthy.
“Then you'll begin to make history,” said the Pearl of great price.
Mr. McCarthy looked thoughtful. The idea of making history brightened his eyes.
“We will see what can be done,” he answered.
Again we took our places in the canoe, and it seemed to spring away with the current.
“We'll ride the belt,” said Mr. Pearl. “We ought to make ten miles between now an' sundown.”