784 



Mr. J. C. Buckley on the 



from which it will be seen that all lines start from almost 

 the same point on the axis of C. 



Now when T=0, equation (2) applies, and C oc&, so that 

 we should expect to obtain lines starting from different 

 points on the C axis. 



In the above case n (and therefore C) is so small that 

 variations due to different breadths are obscured. 



On choosing a paper strip cut in a suitable direction it i» 

 seen that for T = 0, Cccb (fig. 5). 



Fig. 5. 



'1-0 



0-5 



(dyne cms* I0" 5 



) 



3 cms. / 





/ 



0A:0B:0C = 

 1 = 2-3 







2.cms^ 



/cm-. 





-a — 











T 



8oo fables per cm-.} 



3. Dependence of rigidity upon the structure of material. 



It was found that two pieces of paper cut from the same 

 piece, but in perpendicular directions, showed considerable 

 difference in rigidity, though the bifilar effect was the 

 same in both, as indicated by the slope of the C-T curve 

 (fig. 6). 



This means that the distribution of tension producing 

 the bifilar effect is independent of the fibrous structure of 

 the material of the strip ; whereas the rigidity depends 

 greatly upon the structure. This is in accordance with 

 expectation. 



