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Updated: June 28, 2025
In Harry and Lucy, for instance, Lucy, who is the only human figure in the book, is perpetually being snubbed by the terrible hard-headed Harry, with his desperate interest in machinery, by the repellent father who delights to explain the laws of gravity and the parabola described by the stone which Harry throws.
"Now!" he exclaimed ecstatically. "Stand from under, Scraggs!" He pressed a lever. There was a whang, a whistle and the ink bottle hurtled in a beautiful parabola over Greenwich Street. "Gee! look at her go!" cried Willie in triumph. "Straight's a string."
The one redeeming feature in the structure is the cupola; and that is the one thing which Michelangelo bequeathed to the intelligence of his successors. The curve which it describes finds no phrase of language to express its grace. It is neither ellipse nor parabola nor section of the circle, but an inspiration of creative fancy.
While meditating in this wise, he had reached the cathedral, and for the hundredth time stood to admire those powerful abutments throwing out, with the strong curve of a projectile, flying buttresses like spoked wheels, and, as usual, he was amazed by the flight of the parabola, the grace of the trajectory, the sober strength of those curved supports.
A cake of barley bread was on the table, and a little black teapot stood there also. There was no furniture but a low wooden bed, one chair, a settle, and a broad shelf. On the shelf was a slate scrabbled all over with geometrical figures, and one of these figures was a parabola with two tangents drawn touching. This puzzled me much.
As for me, after describing a very respectable parabola, my angle of incidence landed me in a bonnet-maker's shop, having passed through a large plate-glass window, and destroyed more leghorns and dunstables than a year's pay would recompense.
When his father talked over the books with the child, he listened tolerantly to the boy's amusement at how the cake had rolled down the hill, or how the little pig had got into the garden; but he was disappointed that the boy seemed not to care whether the stone which Harry threw described a parabola or not, though there was an odious diagram to explain it, full of dotted lines and curves.
There are for these curves two centres, which come together for the circle, and recede to an infinite distance for the parabola; and the simple law of their formation is, that the curve everywhere makes equal angles with the lines drawn to these two centres.
"Dat's all righd!" spat back the Professor with spiteful emphasis, "I'm addressing my remarks to dis chentleman!" "Ah so!" mimicked Bunker. "Vell, shoodt id indo him! And say, tell him about that tunnel! Tell him how you went in until the air got bad and came out up the hill like a gopher. Took a double circumbendibus and, after describing a parabola "
"'The squares of the times are as the cubes of the distance' means that all motion is the result of two forces acting upon prakriti, and that where the two forces are balanced, or equal, the result in motion is a circle or ellipse, the square of the Repulsion being equal to the cube of the Attraction to make them equal and produce a circle. In other cases they produce hyperbola and parabola.
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