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The Electrotonic Variation with Strong Polarising Currents

Published online by Cambridge University Press:  15 September 2014

George N. Stewart
George N. Stewart
Affiliation:
Owens College, Manchester
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Extract

Let AB (fig. 1) be a piece of nerve interposed in the galvanometer circuit, and CD in the battery circuit. Then, as has long been known, on closing the battery circuit, one obtains a current in the galvanometer circuit, the direction of which in the nerve is the same as that of the polarising current. If, now, stimulation be made, say at I, this current undergoes a negative variation. Hermann, who investigated the subject, after Bernstein, was at first inclined to explain the negative variation by his law of “polarisation increment.”

Type
Proceedings 1888-89
Information
Proceedings of the Royal Society of Edinburgh , Volume 16 , 1890 , pp. 234 - 248
Copyright
Copyright © Royal Society of Edinburgh 1889

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References

note * page 235 Strictly speaking, if E(A), E(B), represent the intensity of excitation at A and B, ∫E(A)dt is >∫E(B)dt for corresponding limits. Considering timeintegrals, B may, therefore, be looked on as positive to A during the tetanus. The galvanometer deflection produced by stimulation will be a measure of the difference of these integrals.

note * page 238 The total resistance of the Rheochord was 2000 centimetre units.