. Electronic apparatus for biological research . Figure Amplifier—A direct-coupled amplifier of maximum gain such that the cathode ray tube spot is deflected to top or bottom of the screen by ±25 mV: this is for intracellular work. In addition, a pre-amplifier, coupled, of short time constant, gain 100 times, suitable for the detection of weak action potentials. Presentation—6 in. diameter flat-faced cathode ray tube, medium per- sistence ( green) phosphor. Power supplies—As requisite. 671

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