THE PHYSICAL PROPERTIES OF CLAY. 



89 



more nearly equal. This is perhaps what might be expected, for 

 if the tensile strength is due to the interlocking of the grains, a 

 mixture of different sizes would fit together more closely than 

 if particles of one size predominated, as in Nos. 4 and 5 of the 

 table. It is rather difficult, however, to compare these results 



90 



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Fh*. 2 7. C a ryes showing re /at/on of texture to tensile 

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with Orton's, as in his artificial mixtures the nonplastic particles 

 were of uniform size, while in the natural mixtures a variety of 

 sizes existed. 



If the theory of interloekment is true, then it should be pos- 

 sible to make a mixture of two clays, whose tensile strength is 



