Lectures on physiology : first series on animal electricity.

  • Augustus Desiré Waller
Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: Lectures on physiology : first series on animal electricity. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    the nerve is from e to e'. e' is more anodic than e, i.e., more zincable, and the excitatory change gives current in the nerve from e to e. Our second experiment is to show that a polarising current is increased during excitation—undergoes a positive variation. (Hermann). The connections are as in fig. 66, as being perhaps a Httle more obvious than would have been the case with polarising current, galvanometer and secondary N PolansdCion /ncremenC S. Po/dnsaCion < Fig. 66. coil in one circuit connected with the nerve by a single pair of electrodes. [The resistance boxes r. R., used as shewn in figs. 10 and 11 on pages t,t, and 38, enable us to take a convenient voltage (o'l to 0*5) for the polarising current.] Usine a Leclanche cell and havino- set the resist- ances at 1000 and 14000 ohms respectively to get a voltage of about 0*1, I close the key in the polaris- ing circuit giving current from e to e' in the nerve.