sc 



Phil. Mag. Ser. 6, Vol. 19, PL I, 



Fig. 3. 





































































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T~WISTlNO &. BCNDINO 



Moments, 

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Fig. 6. 





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- COP/=£ft TuB£ X 

 x - -XI 



O SffASS - XI 



■ XSL 



