PRELIMINARY DATA FOR THE ELABORATION OF THE VISUAL CODE 663 



d 

 a 



Fig. 3. 



Recording from a secondary fiber with a graduai decrease and increase of the light intensity, 

 to which the fiber responds with a corresponding graduai decrease and increase of frequency. 

 The Unes under the recordings show the photo-cell-registration. 

 Maximal light intensity: above 5.3 lux, below 6 lux, Sweeplengths: 5 sec. each. 



a 



b 



c 



Fig. 4. 



Contemporary recording from two tertiary fibers: an IC-on-off-modulated fiber and an off-fiber. 

 The off-fiber with very short (0,2 m/sec), high spikes. The response gets bigger, the quicker 

 the light changes are. The lines under the registrations show the light changes, measured by 

 a calibrated photocell: a) 1.8 lux max., b) 2.1 lux max., c) 2 lux; a) and b) show the responses 

 to 2 différent speeds of light decrease, c) shows several on- and off- responses of the fibers. Also 

 to a graduai decrease of light, the off-fiber responds with a short, high frequency burst (b) 

 and not with a graduai frequency change like the secondary fibers. Trace lengths: 5 sec. each. 



