jump

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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 periodicals archive ?
The train, which was traveling from Poughkeepsie and carrying about 150 customers, jumped the tracks at a curve near the Spuyten Duyvil Station in the Bronx, just a few miles north of its destination at Manhattan's Grand Central Terminal.
Xabier Martinez, a photographer who arrived at the scene as rescue workers were removing dozens of bodies, said two injured train passengers told him they felt a strong vibration just before the train's wagons jumped the tracks.
Just before going into the northwestern shrine city of Santiago de Compostela in Spain, about an hour before sunset Wednesday night, a passenger train jumped the tracks on a curvy stretch and crashed.
The train jumped the tracks in the small town of Lac-Megantic in the province of Quebec, officials said Saturday.
In that state a train could have been derailed or jumped the tracks and hit an on-coming service.
The locomotive and 16 coaches of the Kalka Mail, which runs from eastern Howrah to northern Kalka town, jumped the tracks at 60mph near Malwa station in the Fatehpur district of northern India's Uttar Pradesh state.
Thirteen carriages of the Gyaneshwari Express travelling from Kolkata to Mumbai jumped the tracks and most of the casualties were in four that collided with an oncoming goods train.
Seven coaches and the engine of the 2445 up Bhubaneswar-New Delhi Rajdhani Express jumped the tracks due to the impact of the blast.
Officials and police said the train jumped the tracks as it approached a station near Hua Hin on the Gulf of Thailand before dawn.
A sheriff's office spokesman said dispatchers were told that five cars had tipped over and seven or eight had jumped the tracks.
The Metra train, which was headed into Chicago from Joliet, Illinois was traveling almost 60 mph over the speed limit when it jumped the tracks at a crossover.
While it would be dangerous to jump to hasty conclusions, we must take note of survivor reports that the train was running faster than usual when it jumped the tracks.