The laboratory oscilloscope is designed primarily for use in the nuclear physics laboratory but is a versatile instrument well suited to general circuit research. It contains a sweep generator with writing speeds ranging from 8 inches per microsecond to 1 inch per millisecond. The sweep is initiated by a voltage amplitude discriminator which may be triggered by: (a) an internal trigger generator operating at variable repetition rates, (b) a jitter-free delayable trigger which may be generated at any time from minus 2 to plus 400 microseconds with respect to a fixed trigger from the master generator, (c) from any arbitrary signal greater than 5 volts, and (d), any input to the signal amplifier larger than 0.2 volt. A high fidelity delay line is incorporated in the amplifier circuit so that the sweep may be initiated by the input signal to the amplifier before the signal appears at the scope plates. A 1-volt input to the amplifier will give a 1½-inch screen deflection with a minimum rise time of 0.15 microsecond. The trigger generator, which starts the delay circuits, may be triggered externally by pulses of 15-volts amplitude or more. Sufficient voltage is applied to the type-5CP11 scope tube to permit photography of transients with writing speeds of 3 inches per microsecond using a camera with an f:2 lens opening and Ansco Fluorapid film or Eastman 103–0 plates.