388 



CAST IKON. 



being five of each, and the results quoted are the means of 

 these. The hollow shafts were 0'5in. outside diameter and 

 0*31 3in. inside. The solid shafts were of the same nominal 

 strength (that is, 0'47 ; >in <li;un.), giving a ratio of weight 

 solid to wt'i "-lit of hollow of 1'46 to 1. It will lx> seen that 







the solid shafts give the higher results. 



The diagram for a cast-iron shaft tested by the author 

 is given on Fig. 187. 



CAST IRON ix SHEAR AXD TORSIOX. 



