122 THIRTEENTH ANNUAL REPORT 



DYNAMOMETER TESTS WITH FARM IMPLEMENTS 



PLOWS 



In making the tests with plows only those plows which are in 

 general use in New Hampshire were used. This test is interest- 

 ing as an illustration of the comparative effectiveness of the old 

 and modern types of walking plows. Only two types were avail- 

 able for the trial, but these were characteristic. 



Only one set of trials has thus far been conducted, and the 

 results, while definite, should have a somewhat further demon- 

 stration. It will be noted in the table following that the Yankee 

 plow required a much greater power to do the same amount of 

 work under conditions which were as nearly alike as it is possible 

 to make them : 



Implement. Trial Conditions. Draft. 



Plow. Soil, clay loam. 



Yankee. Furrow slice 13 in. wide by 8 in. deep. 676.3 



Hussey. Furrow slice 13 in. wide by 8 in. deep. 398.4 



HARROWS 



In the following trials with the disc harrow it should be noted 

 that the soil was a clay loam, which had been in sod until shortly 

 before the tests were made. The conditions under which the 

 tests were made were very similar to what would be expected on 

 the average New England farm. It will also be noted that the 

 trials were made under four different conditions of the imple- 

 ments, viz., one with the discs set as far forward as possible, one 

 with the discs set at a medium angle, one with the discs set at the 

 ordinary angle, somewhat away from the straight line, and a 

 fourth condition where the discs were set in a straight line. The 

 tests were made both on grade and on level, and although the 

 series is not comj^lete, yet the results are thought to be of consid- 

 erable value. 



The following table shows the conditions of the trial and the 

 number of pounds of draft under each condition : 



