Hoxda & Konno. 



Phil. Mag. Ser. 6, Vol. 42, PL Y. 



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3 



5 10 



15 



-^Amplitude 

 20 25 mm. 



1 



I 1 



1 



1 1 



2 





o 



n t — 



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2 





o 



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4 





o o o 



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No. 3. 



2 

















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2 







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o No. 1 



n 





* 















Steel 



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6 









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4 





o 





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15 



20 25mm. 



-» Amplitude 



