DEPARTMENT OF AGRICULTURE 123 



Implement. Trial Conditions. Draft. 



Harrow. 



Disc. Set at full an^'lo, up parade, 1 to 8, man riding. 676.2 



Set at full angle, up grade, 1 to 8, no load. 555.4 



Set at full angle, down grade, 1 to 8, man riding. 555.4 



Set at full angle, level, man riding. 618 3 



Set at medium angle, up grade, 1 to 8, no load. 398.0 



Set at medium angle, down grade, 1 to 8, no load. 386.4 



Set at medium angle, level, man riding. 410.5 



Set at ordinarj- angle, down grade, 1 to 8, man riding. 483.0 



Set at ordinary angle, down grade, 1 to 8, no load. 386.4 



Set at straight angle, up grade, 1 to 8, man'riding. 3 30 



Set at straight angle, down grade, 1 to 8. man riding. 241.5 



Set at straight angle, up grade, 1 to 8, no load. 298.8 



Set at straight angle, down grade, 1 to 8, no load. 217.4 



Set at straight angle, level, man riding. 313.9 



Set at straight angle, level, no load. 265.6 



In conducting- a trial to determine the draft of a spring tooth 

 harrow it is important to keep in mind the fact that the actual 

 draft in pounds does not indicate all the j)ower used by this imple- 

 ment. The tendency to unsteady motion dissipates a considerable 

 amount of the force required for actual operation. The results in 

 our trials with the spring- tooth harrow are pretty nearly what 

 would ordinarily be expected when comparing the implement with 

 other harrows. In the table following the results are given under 

 three conditions of draft : 



Implement. Trial Conditions. Draft. 



Harrow. 



Spring tooth. Set ordinary, operated on level, man riding. 627.9 



Set ordinary, operated on level, no load. 531.3 



Set ordinary, operated up grade, no load. 555.4 



CORX BINDERS 



Several trials having for their object the testing of the relative 

 efficiency of different types of corn binders have been planned, 

 and the results here given are only a beginning. The draft in 

 this farm implement is a most important consideration. Their 

 weight has a large effect in their draft, owing, of course, to the 

 fact that a corn field is usually in a high state of cultivation and 

 readily allows the wheels to sink low into the soil. Then, too. the 

 widely varying size of the stalks and resulting varying in weight 

 of the corn itself all tend to make the conditions surrounding a 

 test of this nature variable. The following table will serve to 

 illustrate somethino- of the effect of heavv and lipht corn on the 

 binder : 



