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A traveling-wave cathode-ray tube has been developed which will record single nonrecurrent transients of 0.5 millimicrosecond rise time. The development was directed toward improvement of writing speed, deflection factor, and shielding between horizontal and vertical deflectors. Distortions due to transittime effects, and frequency dependent impedance mismatch of the deflector have been minimized. A deflection factor of approximately 0.5 volt per trace width (33 volt per cm) in the vertical direction has been obtained with a reduction of sensitivity of approximately 4 per cent at 1,000 mc. A recorded writing speed in excess of 1Ã10 trace widths per second (1.5Ã10 meters per second) has been realized. Oscillograms of recorded traces are shown.