l\FT COUPLIXOI 

 the ihaft to torsion which balances the ' moment i 



.IMT.I 



In determining the safe twisting moment fur a mild steel 

 haft,/ ma j be taken equal to 9000 Iba per sqnare inch, 



\ I 



convenience of making and handling, shafts used for 

 transmitting power are generally made in lengths not exceed- 

 ing 90 feet These lengths an < l y couplings, of 

 u. |fa rstd n unpin 



tttijtngt. One form of lx>x coupl: 

 in tii: -j_ h* shafts to be connected 



gainst on.- :nutli .- ;it tl.. I the tx>x, 



!.!. -f cast iron. Tlie shafts are made to rotate as 



