8 



REINFORCED CONCRETE CONSTRUCTION 



cement should be used which will give the requisite strength or 

 degree of imperviousness. 



The curve of maximum density, or ideal curve, for the com- 

 bination of sand and crushed stone with a maximum size of 1 in. 



is shown in Fig. 3. This curve was plotted from a set of rules 

 determined by William B. Fuller and Sanford E. Thompson 

 in an extended series of tests at Jerome Park Reservoir, New 

 York, in 1903 and 1904 1 . These tests, from which the rules 



1 Transactions of the American Society of Civil Engineers, Vol. 59, 1907. 



