XXVIII. 



W. II. WARREN. 



COMPRESSIVE STRENGTH OF CONCRETE.— Series III. 

 Fig. 4. 



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120 160 200 240 280 320 360 days 



Abscissae = Age in days. Ordinates = Crushing force in ffis. per square inch. 



(Mean of two tests.) 

 Cement, ' Tripod brand '; Nepean sand ; bluestone, 2 inch gauge. 



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40 80 120 160 200 240 280 320 360 days 



Abscissae = Age in days. Ordinates = Crushing force in His. per square inch. 



(Mean of two tests.) 

 Cement, 'Tripod brand*; Nepean sand; sandstone 2\ inch gauge. 



