92 



BELL SYSTEM TECHNICAL JOURNAL 



Xs V Xs Xf 



Fig. 6.24 — Effect of change in A' dimension on the activity of a BT-c\xX. quartz plate in an 



oscillating circuit. 



X =y'=. 448MM 



w=Z' 



1 = X= I 1 05MM 



^ 7 

 Z 6 

 ^ 5 



10.0 10.2 10.4 10.6 10.6 11.0 11.2 11.4 116 118 



Z' .'v M M 



Fig. 6.25 — Effect of change in Z' dimension on the activity of a BT-cut quartz plate in an 



oscillating circuit. 



sions from Fig. 6.27 for this case where the Xy' flexures and Z^ shears will 

 interfere to produce poor characteristics. These are shown in Fig. 6.24 

 for flexure modes as Xf and for the shear modes as Xs and do in general cor- 



