. Electronic apparatus for biological research . ©^ S '^a^is tTi (b) Figure attending to this it is worth remarking the nature of the unbalance current. It has three components: a transient of magnitude C, C. [Ci + Cg C3 -|- C4J a final value which it reaches if the pulse goes on long enough of magnitude ^ ii?l + i?2 i?3 + RJ and a phase between them which is the difference of two exponentials cor- responding to the time constants (^'+^^>(^J and (C3 + C4) ' RzR, ^ The observed artefact on the cathode ray tube face may have any of the forms in Figure —but only a, b, or c are at a
. Electronic apparatus for biological research . ©^ S '^a^is tTi (b) Figure attending to this it is worth remarking the nature of the unbalance current. It has three components: a transient of magnitude C, C. [Ci + Cg C3 -|- C4J a final value which it reaches if the pulse goes on long enough of magnitude ^ ii?l + i?2 i?3 + RJ and a phase between them which is the difference of two exponentials cor- responding to the time constants (^'+^^>(^J and (C3 + C4) ' RzR, ^ The observed artefact on the cathode ray tube face may have any of the forms in Figure —but only a, b, or c are at all likely. It is also worth noting at this point that the bridge cannot possibly be balanced if one side of the stimulator output is earthed, if R^ or 7?4 is zero. This puts all the 610
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