Bijilar Property of Twisted Strips. 

 Fisr. 6. 



785 



0-5 



4. Rigidity negligible. 



When n£=0 equation (1) alone applies. Hence i£ we keep I 

 and T constant, we should obtain a linear relation between 

 C and b d . The following table shows this to be true in the 

 case of paper, in which we have previously seen the rigidity 



is negligible. 



The values of C for a particular value of T were read off 

 from the C-T graphs. 



T. 



b. 



b\ 



C. 



C/fi*. 





2-55 



1655 



236800 



14300 



362x981 



dynes 



per cm. 



20 

 1-5 



800 

 3-3S 



122000 

 50000 



15250 

 14800 





10 



10 



15500 



15500 



5. Substances of large rigidity but very small thickness. 



In this case the two terms on the right side of equation (3) 

 are of comparable magnitude. To obtain a bifilar effect in 

 a steel strip it is necessary to have the thickness very small. 



