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A circuit is described which enables two circular timing traces to be placed on a cathode-ray oscillograph. Switching from one trace to the other is effected at a superflicker rate so they are viewed "simultaneously." The circle frequencies normally are in the ratio of five or ten to one; thus, when the same transient is viewed on both scales, the slow sweep gives a general picture of the phenomenon being studied and the fast sweep allows a more detailed examination of a chosen portion of the transient. The analysis of the circuit yields the information needed for element design.