jump

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Related to jumps: jumpstart, Jump Street, JMPS

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 ?
The Duke pointed out the water jump with some trepidation, but the Prince's glasses rested on it only for a moment.
Then they reached the water jump. There was a sudden silence on the stand and the hillside.
He could not backbite, nor envy, nor prevaricate, nor jump at mean motives for generous acts.
"Stop," said the duke, "Pistache, jump for the queen." And he raised his cane six inches higher.
The dog sprang, and in spite of the height jumped lightly over it.
Rikki jumped sideways and tried to run in, but the wicked little dusty gray head lashed within a fraction of his shoulder, and he had to jump over the body, and the head followed his heels close.
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.
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.
The boys jumped for the river -- both of them hurt -- and as they swum down the current the men run along the bank shooting at them and singing out, "Kill them, kill them!" It made me so sick I most fell out of the tree.
It seemed as if Colin could never hear enough of Dickon and Captain and Soot and Nut and Shell and the pony whose name was Jump. Mary had run round into the wood with Dickon to see Jump.
Dolokhov, the bottle of rum still in his hand, jumped onto the window sill.
The wolf and the wild boar were first on the ground; and when they espied their enemies coming, and saw the cat's long tail standing straight in the air, they thought she was carrying a sword for Sultan to fight with; and every time she limped, they thought she was picking up a stone to throw at them; so they said they should not like this way of fighting, and the boar lay down behind a bush, and the wolf jumped up into a tree.