The Tektronix Type 519 Oscilloscope is a wide-band laboratory instrument designed expressly for the observation and measurement of high-frequency phenomena. Fast linear sweeps, high CRT accelerating potential, excellent triggering sensitivity, wide-band trigger system, and vertical bandwidth well beyond 1000 megacycles permit accurate repetitive and single-shot displays to be observed and photographed from fractional-nanosecond signals. An internal delay line in the vertical channel of the instrument permits display of the leading edge of the signal triggering the Oscilloscope weep delay control through 35 nano- seconds permits viewing signals before and after the main signal event.