Jump (vertical)

The term is used to refer to a continuous slight up and down movement on the screen. This may be caused in the projector, or may have been introduced during copying; particularly by copying shrunken film on a step printer.

Vertical jumps occur when a bad splice passes through the gate of the viewing machine with the result that the film will most likely go out of rack. Other times the splice may be out of rack giving the appearance of a jump. A bad splice will make quite a noise as it passes through the gate whereas an out of rack splice will not. Either way a frameline will appear on the screen at the top or the bottom. This is remedied by shifting the gate on the viewing machine.