436 



BELL SYSTEM TECHNICAL JOURNAL 



480 



460 



420 



400 

 O 



Z 



o 

 o 

 01 380 



360 



Z 320 



300 



280 



0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 



RATIO OF OPTICAL TO MECHANICAL AXIS 



Fig. 28 — Coupled frequency curve for shear and flexure vibrations. 



Fig. 29 — Bar bent in its second flexural mode of vibration. 



