COMPOSITION AND PROPERTIES OF NATURAL CEMENTS. 277 



Modulus of elasticity. Tests of the modulus of elasticity of several 

 American natural cements made at Watertown Arsenal* are sum- 

 marized in Table 136. 



TABLE 136. 

 MODULUS OF ELASTICITY. 



* Report of tests of metals, etc., made at Watertown Arsenal, for 1902, pp. 501- 



505. 



