Abstract
The paper describes a two-section electronic device for better recording of rapid bioelectric phenomena on the cathode-ray oscillograph screen. In section A (fig. 2), proportional brightening of the trace during transient phenomena is achieved by application of a suitable positive voltage to the cathode-ray tube grid (Z input). This voltage, proportional to the increase in writing-speed of the spot, is obtained by differentiation of the input signal. In section B (fig. 3), intensity modulation is produced by a positive square voltage applied to the grid. The square pulse is delivered by a one-shot multivibrator, triggered by the phenomenon under observation. This same device, used as a negative pulse-generator driven by an external oscillator, may produce intensity-modulated timing markers which blank the trace at known intervals. The use of either beam-intensifying device described is discussed in the paper.
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