﻿24: 



Stresses in Rectangular Bar 

 Fix. 11. 



eo 



1-8 

 16 

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 10 

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 -12 

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•4-5 — W --35 —30 



25 -<20 —15 —10 —05 



Values of ays, 



20 85 30 -35 .-4-0 -4-5 50 

 Tnecftei-ric/iL.. 



error in the determination o£ the height 2b of the block, 

 but there is no 'reason to doubt tLe accuracy of the latter 

 measurement. 



§ 10. Conclusion. 



On the whole the investigation affords satisfactory con- 

 firmation of the results obtained from the mathematical theory 

 of elasticity. It confirms the parabolic distribution of shear 

 across a bar of rectangular section which is usually assumed 

 by engineers, so lono- as we are at a reasonable distance 

 from points of loading, and in the neighbourhood of points 

 of loading it shows that the theory worked out by the 

 author probably does give a fair representation of the actual 

 distribution of stress. 



It also shows the considerable value of the isoclinic lines 

 in dealing with such " photoelastic " problems. The tendency 

 of investigators has usually been to employ the isochromatic 

 lines for this purpose. These, however, are in many ways 

 inconvenient. To give accurate results, they involve the 

 knowledge of the dependence of the stress-optical coefficient 



