[Puin. Journ. Sct., VII, A, No. 3. To face page 158. 
ttawa sand briquettes. 
1:3 standard Tarlac sand briquettes. 
Tensile strength in pounds 
per square inch. 
Age in days. 
7. | 28. | 90. | 360. 
Method 
of 
molding. 
1 
Amount 
of water 
used. 
Tensile strength in pounds 
per square inch. 
