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Updated: May 10, 2025
This being settled, Overholt returned to New York and went to two or three places in the Bowery, well known to him, where he bought certain fine tools and pieces of the most perfectly turned steel spring, and several other small objects, which he needed for the construction of the new tangent-balance he had to make for the reversed curve.
The idea which developed suddenly in all its clearness was that he had made one of the most important parts of the machine exactly the converse of what it should be; what was on the right should have been on the left, and what was down should certainly have been up. Then the engine would work, even if the tangent-balance were a very poor affair indeed.
It was going to be an awful wrench to give up the invention, for now, at the moment of abandoning it, he saw, or thought he saw, that he was right at last, and that it could not fail. It was useless to try it as it was, yet he would, just once more. He adjusted the tangent-balance and the valves; he put in the supply of the chemical with the long name and screwed down the hermetic plug.
Meanwhile, before it happened, Overholt and the boy were perfectly happy. All day long the inventor worked at the tangent-balance, till he had brought it to such perfection that it would be affected by a variation of one-tenth of one second in the aggregate speed of ten revolutions, and an increase or decrease of a tenth of a grain in the weight of the volume of the compressed air.
After an hour Overholt came to the conclusion that he had better take Pandora's box out to the cottage and sit on it there, since nothing suggested itself to him, in spite of his immense good-will to accept any suggestion which the spirit of coming Christmas might be kind enough to offer; and if he could do nothing else, he could at least work at his machine, and try to devise some means of constructing the tangent-balance, with the materials he had left, and perhaps, by the time he was thoroughly grimy and the workshop smelt like the Biblical bottomless pit, something would occur to him for Newton.
There were the ups and downs, the crooked old roads and lanes and the straight new streets, the little wooden cottages and the big brick houses, and there was the grassy common with its trees and its tiny iron railing; and John Henry easily made posts to carry the trolley wires, which had seemed an impossible dream to the boy, beyond all realisation; and one day, when the inventor seemed farther from the tangent-balance than ever, he spent a whole afternoon in making a dozen little trolley-cars that ran on real wheels, made by sawing off little sections from a lead pencil, which is the best thing in the world for that, because the lead comes out and leaves nice round holes for the axles.
John Henry had it badly, for he had been thinking of the tangent-balance, his wife, his boy, and the coming Christmas, all together, since he had got home, and the three problems had got mixed and had made his head ache. Nevertheless he looked up from his work-table and smiled when his son came in. "Everything all right?" he asked, with an attempt to be cheerful.
"What is it?" asked Overholt, looking up, for he had gone back to his work and was absorbed in it. "The boys are all beginning to talk about Christmas down at the school. Now what are we going to do at Christmas? I've been wondering." "So have I!" responded the man, laying down the screw-plate with which he was about to cut a fine thread on the end of a small brass rod for the tangent-balance.
When Overholt had swallowed his cold tea, he got out his drawing materials, stretched a fresh sheet of thick draughtsman's paper on the board, and sat down between the motor that would not move and the little city in which Hope had taken lodgings for a while, and he went to work with ruler, scale and dividers, and the hard wood template for drawing the curves he had constructed for the tangent-balance by a very abstruse mathematical calculation.
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