278 



Report of the Special Committee. 



The average width of the furrows from the eighty-ninth to one 

 hundred and second experiment was 12.57 inches; the average 

 drauglit was 469 pounds; the average increase of draught for each 

 inch is 19^ pounds. 



Recapitulation. 



It will be observed that the draught required for each square 

 inch of sectional area increases as the size of the area diminishes. 

 This accounts for the greater amount of draught of this plow, as 

 shown in the table on pages 268, 269. 



III. What is the increase of power required when the furrow 

 slice remains of the same size for each successive increment of 

 velocity ? 



We endeavored to answer this question by the following experi- 

 ments made with Holbrook's Plow No. 65, cutting a furrow seven 

 inches deep and fourteen inches wide: 



In order to facilitate a comparison of our experiments with 

 those of Mr. Pusey, which are given in the report on ploAvs, we 

 give the following table, in which the preceding experiments are 

 repeated in another form: 



