Response in the living and non-living / by Jagadis Chunder Bose.

  • Jagadish Chandra Bose
Date:
1902
Catalogue details

Licence: Public Domain Mark

Credit: Response in the living and non-living / by Jagadis Chunder Bose. Source: Wellcome Collection.

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    produce a displacement of zero. By means of a potentiometer the galvanometer spot may be brought back to the original position. The shifting of the zero will not affect the general result. The effect of o mechanical stimulus is to produce a transient electro¬ motive response, which will be superposed algebraically on the existing P.D. The deflection will take place from the modified zero to which the spot returns during recovery. On now stimulating the wire as a whole by, say, torsional vibration, the current of response will be Fig. 52.—Response by Method of Depression (Without Block) When the wire is stimulated as a whole the current of response is towards the more excitable. In (a) A is a normal contact, B has been depressed by oxalic acid ; current of response is towards the more excitable A. In (5) the same wire is used, only A is depressed by oxalic acid and a normal contact is made at a fresh point B', a little to the left of B in (a). Current of response is now from A towards the more excitable B'. found towards the more excitable, i.e. from B to A (fig. 52, a). A corroborative reversal experiment may next be made on the same piece of wire. The normal contact, through water or salt solution, is now made at b', a little to the left of B. The excitability of A is now depressed by oxalic acid. On stimulation of the whole wire, the current of response will now be found to flow in an opposite direction—i.e. from A to b'—but still from the relatively less to the relatively more excitable (fig. 52, b).
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