COMPARISON OF FORMULAE 7 



proportioning belt drives is the practice recommended by 

 the author. 



Fig. i presents curves showing the horsepower transmitted 



S Naglefs Formula 

 X -HSifagle Belt or 

 '_ LDouble-Belt-l 



1000 2000 3000 4000 



Velocity of Belt, Ft. per Min. 



5000 



FIG. i . COMPARISON OF VARIOUS FORMULAE FOR HORSEPOWER TRANSMITTED 



BY BELTING. 



according to the different formulae which have been discussed 

 on pages 3 and 4 . It will be observed that the rule of 

 thumb formulae give straight-line curves, while the Earth and 



