ACCELERATION EFFECTS ON ELECTRON TUBES 



1211 



tension and compression stresses respectively, thereby producing the 

 desired charges in these elements. The characteristics, i.e., the resonant 

 frequency and sensitivity, of these elements are largely determined by 

 the dimensions of the metal member. Relatively high internal capacities 

 can be obtained by this construction. A recent variation of such a struc- 

 ture is shown in Fig. 6(b). In this design the inner metal component of 

 the cantilever described above has been eliminated. The entire structure 

 is made of the active material, in this case in cylindrical shape for ease of 



320P 



300° 



290" 



260° 



250' 



240P 



23Cf 



COMPRESSION TYPE 



220° 



190° 180° 170° 160° 



Fig. 5 — Relative angular response of compression and shear type ferro electric 

 crystal accelerometers. 



