REPRODUCTION OF MAGNETICALLY RECORDED SIGNALS 



1147 



100 



200 300 400 600 1000 2000 3000 



FREQUENCY IN CYCLES PER SECOND 



5000 



Fig. 2 — Response curves taken at 21 in./sec. Recordings were made with head in 

 contact and were played back first with head in contact and then with a spacing of 4 

 mils between head and disc. 



0.1 



0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 



SPACING IN WAVELENGTHS , Cl/\ 



Fig. 3— Data obtained as in Fig. 2 show spacing loss approximately equal to 55{d/\) 

 decibels. 



