92 



TABLE 69. 



MECHANICAL PROPERTIES. 

 TABLE 69. Stone and Clay Products. 



GENERAL NOTES. i. Later transverse strength (flexure) tests on Wisconsin building stones 

 (Johnson's "Materials of Construction," 1918 ed., p. 255) show moduli of rupture as follows: 

 Granite, 1.90 to 2.75 kg/mm 2 or 2710 to 3910 lb/in 2 ; limestone, 0.80 to 3.30 kg/mm 2 or 1160 to 

 4660 lb/in 2 ; sandstone, 0.25 to 0.95 kg/mm 2 or 360 to 1320 lb/in 2 . 



2. Good slate has a modulus of rupture of 4.90 kg/mm 2 or 7000 lb/in 2 (loc. cit., p. 257). 



SMITHSONIAN TABLES. 



