THE MK^ROWAVK GYRATOR 



19 



E(|uati()n (25). For a particular sanipl(> of nianganesc zinc ferrite, the 

 following measurements were made: 



(Sample No. 1) 



c' = 17 



c" = 24 



47r3/sat = 1500 gauss 



Using this data, eciuation (25) predicts: 



- = 121.27cm. 



It is seen in Fig. 6, that the actual measured rotation at saturation is 

 approximately 123°/cm. Hence an extremely good agreement with 

 theory has been obtained for this particular sample. 



Equation (25) also indicates that the rotation per unit path length 

 should be sensibly independent of frecjuency within the above ap- 

 proximations. The data are shown in Fig. 8. However, it will be noticed 

 that the frequency difference between these two sets of data is relatively 

 small (3 per cent), and the cumulative experimental error in measuring 

 angles is such that it is difficult to state that the rotation is closer 

 than 1° between the two sets of data. This represents a possible differ- 

 ence of 5 per cent in the rotation for a change of 3 per cent in the fre- 

 quency. Thus, even though these preliminary data support Equation 

 (25), it cannot be accepted as conclusive evidence until more measure- 

 ments can be made over a wider band width. 



24 



400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 

 APPLIED MAGNETIC FIELD IN OERSTEDS 



Fig. 8 — Dependence of Faraday rotation ujjon freciuency. 



