2 5 8 



CLAYS AND CLAY INDUSTRY. 



that the modulus of rupture in the stiff-mud bricks ranges from 

 513 to 1,750 pounds, with an average of 950 pounds, while in the 

 soft-mud the variation lies between 141 pounds and 1,042 pounds, 











STI 



FT 



MUD 





B 



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CK. 









LBS. 













































1 



























































































































































































II OOO 













































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I 2 3 4 5 6 7 8 9 IO II 12 13 14 15 16 17 18 19 20 21 22 23 



Fig. 39. 



Diagram showing lack of close agreement between crushing strength and 

 transverse strength of stiff -mud brick. 



with an average of 571 pounds, or nearly 50 per cent, less than 

 that of the stiff-mud. 



3. If the crushing and transverse tests are shown graphically, 

 as in Figures 38 and 39, it will be seen that the transverse breaks 



