1354 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1953 



4CX) 800 1200 1600 2000 2400 2800 3200 3600 4000 4400 4800 

 APPLIED FIELD IN OERSTEDS 



Fig. 11 — Absorption versus applied field for positive and negative circular 

 polarizations. Ferrite cylinder diameter was 0.125". 



procedure is often used. This consists simply of exciting the circularly 

 polarized components separately and measuring the phase shift and 

 attenuation of each of these components with the equipment shown in 

 Fig. 10(b). There is no ambiguity in these results, and the equivalent 

 rotation can easily be calculated from the phase data. 



Because Polder's permeability matrix is made linear by approxima- 

 tions it is desirable to verify that the measurements made with circular 

 polarization can be superposed to produce the same result as would be 

 obtained using linear polarization.^^ For this purpose we choose a ferrite 

 sample which exhibits a fairly complicated loss curve for both circular 

 components. The absorption characteristics for both circular polariza- 



" An experiment of this type was first performed by J. P. Schafer of Bell Tele- 

 phone Laboratories in 1951 to establish the veracity of observed Faraday Rota- 

 tions. 



