jump


Also found in: Dictionary, Thesaurus, Legal, Financial, Acronyms, Idioms, Encyclopedia, Wikipedia.

jump

The displacement of the image of an object occurring when viewing across the borderline between two portions of different power in a bifocal or trifocal lens. The jump is eliminated by placing the optical centres on the dividing line; the lens is then called a no jump bifocal (e.g. a monocentric bifocal with a straight dividing line) (Fig. J1). Syn. image jump; prismatic jump. See monocentric.
Fig. J1 Image jump upward caused by the segment of a bifocal lens, as the direction of gaze is lowered across the dividing lineenlarge picture
Fig. J1 Image jump upward caused by the segment of a bifocal lens, as the direction of gaze is lowered across the dividing line
References in classic literature ?
"There are jumps, for one thing," Somerfield continued,--"pretty stiff affairs, too."
"But," interposed Monsieur de Chavigny, "it seems to me that Pistache is only doing what other dogs have done when they jumped for Mademoiselle de Pons."
The dog sprang, and in spite of the height jumped lightly over it.
But he did not grow too proud, and he kept that garden as a mongoose should keep it, with tooth and jump and spring and bite, till never a cobra dared show its head inside the walls.
He jumped up in the air as high as he could go, and just under him whizzed by the head of Nagaina, Nag's wicked wife.
His father ran out with a stick, but by the time he came up, Karait had lunged out once too far, and Rikki-tikki had sprung, jumped on the snake's back, dropped his head far between his forelegs, bitten as high up the back as he could get hold, and rolled away.
Then he jumped. The head was lying a little clear of the water jar, under the curve of it; and, as his teeth met, Rikki braced his back against the bulge of the red earthenware to hold down the head.
He looked at the cotton wool, decided that it was not good to eat, ran all round the table, sat up and put his fur in order, scratched himself, and jumped on the small boy's shoulder.
The robbers sat round the fire, sang and drank; and the old female robber jumped about so, that it was quite dreadful for Gerda to see her.
However, towards morning she takes a draught out of the large flask, and then she sleeps a little: then I will do something for you." She now jumped out of bed, flew to her mother; with her arms round her neck, and pulling her by the beard, said, "Good morrow, my own sweet nanny-goat of a mother." And her mother took hold of her nose, and pinched it till it was red and blue; but this was all done out of pure love.
That may seem illogical, but it is advisable to count Irish wins for jump jockeys because we often publish the all-time list of winningmost riders - and that list would be incomplete without Ruby Walsh, Barry Geraghty, Paul Carberry, Davy Russell and Charlie Swan.
Under-20 events: Men- 100m, 200m, 400, 800m, 5,000m, 10,000m, 110m hurdles, 400m hurdles, 3,000m steeplechase, 10,000m race walk, 4x100m, 4x400m,high jump, long jump, triple jump, shot put, discus, javelin.Women:- Men- 100m, 200m, 400, 800m, 5,000m, 10,000m, 100m hurdles, 400m hurdles, 3,000m steeplechase, 5,000m race walk, 4x100m, 4x400m,high jump, long jump, triple jump, shot put, discus, javelin.

Full browser ?