. Electronic apparatus for biological research . * Output to —'^ tissue Figure waveform has the form shown; a sharp rising phase followed by an expo- nential decay. The magnitude of the shock depends on the mutual induc- tance between the coils—one is arranged to slide in and out of the other— and the time constant of the decay depends on the self inductance of the secondary winding and the resistance of the preparation, being equal to the 1 Low resistance buzzer 41/2V Dry battery

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