Il6 SCIENCE OF SUCCESSFUL THRESHING. 



as the power necessary to raise 33,000 pounds one foot per 

 minute. A horse walks two hundred feet per minute in 

 traveling around the eighty-nine foot circle two and one- 

 quarter times per minute so that to do work equal to one 

 "horse-power" it is necessary for it to pull only one-hundred 

 and sixty-five pounds, which is the quotient of 33,000 di- 

 vided by 200. This quotient does not allow for the friction 

 of the machine. 



The Number of Horses. When desired for light work, 

 the regular twelve-horse power with six sweeps may be used 

 with only six horses by tying up equalizers on the empty 

 sweeps and attaching teams to alternate sweeps, or by hitch- 

 ing a single horse to each sweep. In the same manner any 

 of the other sizes of horse-powers may be used with half 

 the usual number of horses. Since different numbers of 

 sweeps are used the holes in the bull-wheel are marked with 

 dots so that the brackets and end-supports for the sweeps 

 may be easily placed in their proper positions. One of each 

 of these castings should be first bolted to the holes with 

 three dots near them for this set of holes is used with any 

 number of levers. Bull-wheel 89 W has the dots at the side 

 of the holes for twelve horses, inside of the holes for ten 

 horses, and outside of the holes for eight horses. Bull- 

 wheel loW has the dots at the sides of the holes for twelve 

 horses, inside of the holes for ten horses and outside of the 

 holes for fourteen horses. 



