\|nil. J!)21. 



S C! 1 E N T I PM C AGRICULTURE 



1.')1 



Figure 3. 



surface at this ])iiiiit. The result is that the front plow- 

 tends to take more '"land". The trouble in the above 

 extreme ease was that the bolts holding this casting to 

 the frame were both loose. A monkey wrench fixed 

 the plow in two minutes. The plow was all right; 

 was the man behind it all right? Lay a straight edge 

 along the landside and measure 14 inches over as 

 shown ; some advocate l^Vi; inches, and this will depend 

 on the "set" of the implement at work. Tlie set oi the 

 colter and the hitch will be dealt with in their ])roper 

 place. 



Plows Not Cutting the Same Depth. 

 The fai'mer should very carefully measure the "suc- 

 tion" of the plow when new. It has "suction" under 

 the landside and also on the side, to give penetration 

 and "land". A .straight edge and a rule are all that 

 are required to get this information. (See Pig. 6A.) 

 You should scratch the measurements down on the 

 shop door, or in a note book or in your head. The 

 manufacturer gives his particular plow a definite 

 "set" and this "set" must be maintained if the best 

 results are desired. You M'ill know if the village 

 blacksmith has given the share more or less, if you 

 have the figures; some think that an eighth of an inch 

 more or less "suck" makes lU) differeiU'C; it does, and 

 usually too much is given, and it may take ■')0 iier cent, 

 more power to ])nll llie ])low. The team liavc (he heavy 



THE SET OR ADJUSTMEMT OF A PLOW 



>^ METHODS of ADJUSTINO 



SUCTION 



Figure 5. 



end to bear; if the plow was an old walking plow you 

 would very soon find out something was wrong and 

 have it fixed. Do not be too hasty in condemning the 

 jjIow. You or the blacksmith may be to blame. The 

 ".suction" ean be altered on some plows at the point 

 marked "s" by raising the frame on the rear axles. 

 (Sec Fig. 5.) The two cuts (5A and 5B) on the right 



T 



LOW Smar.es 



Shou'inj lltaj of Share in form <br Dry Soil 



ShnDing lUing of Shan: in to for %.<\s\ Soil Fl^ • t? 



Figure 6. 



hand side of the same illustration show how suction 

 is adjusted in engine plows. However, this sliould be 

 a last resort. A walking plow is given "bearing" at 

 the wing of the share, more in moist soil than in hard, 

 dry soil. This is required to hold the plow level and 

 prevent it "winging" over. A gang plow share does 

 not require any because the bottom is held up by the 

 bails (the U-shajied bars on which the beams swing). 

 Turn the plow up and lay a straight edge from tlie 

 heel of the Lnulside to the wing of the share. Figure 

 (i "A" shows "suction" on bottom of landside. Fig- 

 ure 4 "A" shows snction to the land. Figure 6 "C" 

 shows a .share suitable for moist, soft soil. Figure 6 

 "B" shows a share in foi-m for liard, dry soil or a gang 

 plow. Figure 6 "D" shows a share that would do well 

 for an average gang plow. You ean readily see that, 

 if by mistake a shipper sends you one of each kiiul 

 when you order a new set for \our plow, one furrow 

 will be deeper than the other and the .source of trouble 



"^ii 



Sear/'f i^^ 



Figure 4. 



Figure GD. 



