128 



Table 73 

 MECHANICAL PROPERTIES 



Stone and Clay Products 



General Notes. — 1. 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. cil., p. 257). 



Smithsonian Tables. 



