286 



Prof. J. C. Bose. On Electromotive Wave [May 21,. 



steady and permanent condition, when the responses are uniform : and 

 lastly (5) when vibration is continued for too long a time, the positive- 

 tends to become less positive, the responses decline — a state of things^ 

 which we designate as fatigue. 



Increased Electromotive Variation with increased Intensify of Stimulus. 



When the intensity of stimulus is increased by increasing the- 

 amplitude of vibration, the electric response is enhanced. The follow- 

 ing is a pair of records (fig. 9) for increasing amplitudes from 5° to- 

 40°, and decreasing amplitudes from 40° to 5°. The vibrations are 

 imparted at intervals of 1 minute. It will be noticed how the response- 

 is enhanced with increasing stimulus. 



(b) 



10° 15° 20° 25° 30° 35° 40° 4<f 35° 30* 25° 20° 15° 10° 5 ( 



Tig. 9. — Photographic records of response curves, (a) from 5° to 40°, (b) fions 

 40° to 5°. The vertical line = 0\L volt. 



Table I. — Showing the Increasing Electromotive Effect due to 

 Increasing Amplitude of Vibration. 



Vibration, 

 amplitude. 



o 

 10 

 20 

 25 

 30 

 35 

 40 



Deflection. 23 dns. = 0*1 volt. 



Ascending. 

 5 '5 

 13 



25-5 



33 



39 



43 



47 



Descending. 

 5 

 12 

 26 

 32 

 39 

 43 

 48 



