Sec. 3-1] 



.1 FA ONE TIC T RA NS D UCERS 



179 



Methuen & Co. Ltd., London, 1934; E. M. Underbill (ed.), "Permanent Magnet 

 Handbook," Crucible Steel Company of America, Pittsburgh, Pa., 1957; 

 S. R. Williams, "Magnetic Phenomena," McGraw-Hill Book Company, Inc., 

 New York, 1931. 



io" 



10" 



10" 



Induction method: 



d-c fields 



a-c fields 

 Moving coils: 



Translation 



Rotation 



Oscillation 

 Induction in moving liquids 



Magnetron tubes 

 Electron-beam magnetometer 

 Hall effect 

 Bismuth spiral 



Inductance variation 

 Permeability variation 

 Even harmonics method 

 Peaking strips 



Nuclear resonance 



Moving coil 



Wire -loop deflection 



Single-wire mech. defl. 



Thermal method 



Faraday effect at microwaves 



Orientation in colloidal susp. 



10" 



10" 4 



10" 



10" 



10" 



c:: 



10' 



10" 



10 4 

 ,-J 



10 z 



10" 



II] 



Table 12. Useful Range of Magnetic Transducer Systems 



Field strength, amp/m 

 Field strength, oersteds^ 

 Induction in gauss J 



Induction, volt-sec/m 2 



10 6 



i 



10 4 



10 



]_. 



