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BELL SYSTEM TECHNICAL JOURNAL 



they are spaced so that the effect of coupHng between them will not influence 

 the frequency constant that is determined experimentally. These regions 

 have been investigated and the result for the flexure modes is that shown 



Fig. 6.21 — Flexure resonances in a GT-cut quartz plate. 



in equation 6.20. From Fig. 6.19 the high order Zx shears along Z' will be 

 coincident with the high frequency Xy' shear at frequencies given by 



fz's = ', fig't kilocycles 



6.27 



From Fig. 6.20 high orders of the same Zj shear along X will be coincident 

 with the high frequency Xy shear at frequencies given by 



