PRINCIPLES OF MOUNTING QUARTZ PLATES 



185 



shown in Fig. 8.4 where the amount of solcJer in the cone equals that of a 

 solder pellet 20 mils in diam.etcr and 12 mils high. 



Figure 8.9 shows the change in frequency as a result of clamping one wire 

 of a four-wire mounting of a GT-cut crystal designed for use as a filter ele- 



0.020 0.040 0.060 0.080 0.100 0.120 0.140 



DISTANCE FROM CRYSTAL SURFACE IN INCHES 



Fig. 8.7 — Effect on frequency and activity of clamping one lead of 500 kc. CT-cut crystal 



t 0.40 



-10 

 -20 



0.040 0.060 0.080 0.100 0.120 



DISTANCE FROM CRYSTAL SURFACE IN INCHES 



Fig. 8.8 — Effect on frequency and activity of clamping one lead of 370 kc. CT-cut crystal. 



ment at 164 kilocycles. This change is shown for the lower resonance at 

 143 kilocycles since this mode would be more aflfected by clamping. The 

 large deviations in frequency correspond to clamping at the loops of the wire 

 as shown in Figs. 8.8 and 8.9 but the small sudden changes in frequency are a 

 result of a second system of standing waves as previously described. This 



