OF PAPER A method and technique for the testing and calibration of oscillographs is described, using an auxiliary vibrator or "oscillographmeter" for the production of Lissajous optical figures, whereby the resonant frequency fo of the tested oscillograph may be readily ascertained. From this and one other test, which is preferably a comparative calibration at 60 and at the resonant frequenev, the bluntness of resonance B of the oscillograph is determined.From the two essential constants fo and B of an oscillograph, its indications at any assigned frequency can be corrected for the inertia of its vibratory system. At high frequencies, the correction may be relatively large.A number of oscillographs have been tested for their fo and B. The principal results obtained are reported in the paper.

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