8UPPLE3IENTARY PlOW. TRIALS. 



277 



our experiments for all the plows, 64.05 pounds. Accordino; to 

 Mr. Pusey's experiments the ditference for each inch was 63.33 

 pounds. According to Mr. Morton's, the ditference was 86.66 

 pounds. 



II. What is the increase of power required for each successive 

 inch of width in plowing ? 



We answer this question by the following table, showing the 

 result of experiments made for the purpose with Holbrook's Plow 

 No. 65. The coulter was set with its point two inches above the 

 sole of the plow. We began with the narrowest furrow, working 

 gradually wider. All the furrows were intended to be seven 

 inches deep, and all were so except the eighty-fourth, which was 

 six inches deep: 



REMARKS 



Average of eighty-fifth and eighty-sixth experiments, 441 



pounds. 

 Average of eighty-seventh and eigthy-eighth experiments, 



443 pounds. 

 Average of eighty-ninth and ninetieth experiments, 522 



pounds. 

 Average of ninety-first and ninety-second experiments, 



496 pound-s. 

 Average of ninety-third and ninety-fourth experiments, 



499 pounds. 

 Average of ninety-fifth and ninety-sixth experiments, 454 



pounds. 

 Average of ninety-seventh and ninety-eighth experiments, 



454 pounds. 

 Average of ninety-ninth and one hundredth experiments, 



456 pounds. 

 Average of one hundred and first and one hundred and 



second experiment, 405 pounds. 



* These experiments made it evident that the plow was working unnaturally. Each 

 successive furrow was wider than the next succeeding one; the sole of the plow was 

 therefore wedged hy the shoulder thus formed, and required more power than it would 

 if the channel on the right hand had been free. We, therefore, concluded to begin 

 with the widest furrow and work down to the narrowest. The coulter was set flush 

 with the land side. 



f Stones in the bottom of the furrow. 



X At this point we set the point of the coulter one-quarter of an inch in from the 

 land side. 



