Crysial 



pick-up cartridge 



\ 



Tension wire 

 soldered to 

 needle 



Cam to lift bar 

 clear during 

 setting up 



/ 



Barium titanate 

 bar in compression 



Universally mounted 

 preparation holder 

 (Note ligtitening 

 holes ) 



(a) 



Figure 33.10 Piezo-electric transducers: (a) gramophone pick-up; 

 (Jb) barium titanate bar 



