TABLE 71. 



STRENGTH OF MATERIALS.' 



in other than the ordinary inch pound units. 



t On the authority of Wertheim. 



t The crushing strength of cast iron is from 5.5 to 6.5 times the tensile strength. 



NOTBS. According to Boys, quartz fibres have a tensile strength of between 1 16000 and 167000 pounds per square 

 inch. 



Leather belting of single thickness bears from 400 to 1600 pounds per inch of its breadth. 



SMITHSONIAN TABLES. 



