240 



Report on Trials of Plows. 



It will be observed that the average cliifereiice between the two 

 first and two last, amounting to 159 pounds, is altogether too 

 great to be accounted for by the very slight increase of one inch 

 in the width of the furrow, and was obviously due to the hetero- 

 geneous character of the soil, which varied very greatly in tena- 

 city and density in the space of a few feet. 



In order to determine this matter more fully, we made experi- 

 ments with this plough at various depths, the results of which 

 are recorded in the following tables: 



Holhrooh^s Bod and Buhsoil. 



Width of furrow, 12 inches. 



Depth in 

 inches. 



Distance in 

 yards. 



Half power in 

 pound yards. 



First furrow . . 

 Second furrow 

 Third furrow . 



101 

 124 



154 

 146 

 149 



50,800 

 55,000 

 59,700 



In the following table these numbers are reduced to actual draft 

 and draft per cubic foot in pound yards: 



DEPTH OF FURROW 



Actual 

 draught. 



Draught per 

 cubic foot. 



8 I inches 

 10 5 inches 

 12i inches 



660 

 753 

 801 



931 



861 



785 



This shows the heterogeneous character of the soil in a very 

 striking manner. In the first experiment 121 square inches of 

 furrow slice were turned over, with a force of 582 yard pounds; 

 in the second experiment 660 yard pounds were required to turn 

 over a furrow slice of 102 square inches. 



In the first experiment, 741 jnvd pounds were required to turn 



