Page:On Electromotive Wave accompanying Mechanical Disturbance in Metals in Contact with Electrolyte.djvu/1

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1902.]
On Electromotive Wave accompanying Disturbance.
273
"On Electromotive Wave accompanying Mechanical Disturbance in Metals in Contact with Electrolyte."[1] By Jagadis Chunder Bose, M.A., D.Sc., Prof. Presidency College, Calcutta. Communicated by Professor Reinold, F.R.S. Received March 14,—Read May 15,—Revised May 21, 1902.

Take a rod of metal, and connect the two points A and B with a galvanometer by means of non-polarisable electrodes. (Fig 1, a.) If the point O is struck, a wave of molecular disturbance will reach A and B. It will be shown that this is attended by a wave of electric disturbance. The mechanical and the attendant electrical disturbance will reach a maximum and then gradually subside. The resultant effect on the galvanometer will be due to EA - EB where EA and EB are the electric variations produced at A and B. The electric changes at

Fig. 1.—In (a) mechanical disturbance applied at O produces similar electrical disturbances at A and B; there is no resultant effect. In (b) owing to a clamp, disturbance applied at A cannot reach B. A tap or vibration imparted to the end A produces responsive current which flows in the wire from the unexcited B to the excited end A. Disturbance of B gives rise to a current in the opposite direction. (c) gives the record of the response to equal stimuli applied to A and B. The ascending part of the curve shows the effect of stimulus, the falling part shows recovery. (d) Simultaneous stimulation of A and B gives no resultant response. (In the records dotted lines represent recovery.)

A and B will continuously balance each other, and the resultant effect on the galvanometer will be zero, (1) if the mechanical disturbance reaches A and B at the same time and with the same intensity, (2) when the molecular condition is similar at the two points, and (3) when the rate of rise and subsidence of disturbance is the same at the two

  1. ↑ A preliminary account of this investigation was given in a paper "On Response in Inorganic Substances," read before the Society, June 6, 1901.
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