242 Report on Trials of Plows. 



long and 1\ inches Avide. A vertical projection descends from 

 it 2 inches long. From this a horizontal projection extends 2^ 

 inches; from the end of this a vertical plate descends 8 inches, and 

 is perforated with live holes, 1 inch apart and ^ inch in diameter. 

 A strong clamp on the right side of the standard is bolted to 

 these holes, according to the desired depth of subsoiling. The 

 stem hinges on the first mentioned shaft on the clevis, which is 

 16 inches long and 1 inch by | inch. It passes backward, and is 

 fastened by the clamp; it then bifurcates into two curved arms, 

 11 inches long and 8 inches apart at the roar extremity. A knife 

 shaped like the letter U, but brought to a lancet-shaped point 

 beneath, which is 13 inches below the bifurcated arms, and 3 

 inches wide, is fastened to the arms by two bolts. The upper 

 arms of the knife are curved over towards the plow, having a 

 slot in their extremities so as to change the angle at which it 

 enters the ground at pleasure. The lower part of the knife is 

 not in the same plane on both sides, the hinder part being an inch 

 and three-quarters higher than the front edge; the soil dug up by 

 the front edge is therefore raised vertically 1| inches, and falls 

 the same distance back into the furrow channel from the back 

 edge, which pulverizes it very well. 



The plow was first tried alone, without the attachment for 

 subsoiling, with the following result: 



Furrow, 7 inches deep and 8 inches wide. 



]32 yards — Half power in pound yards, 34,600 pounds; actual 

 power in yard pounds, 524 pounds. 



After the attachment was applied, the furrow was ten inches 

 deep, or three inches lower than before, which was therefore the 

 amount of subsoiling actually performed. The power required to 

 accomplish this work, viz., a furrow slice 7 inches deep and 8 

 inches wide, turned over, and 3 inches deep and 8 inches wide, 

 pulverized at the bottom of the furrow, was 74 yards. 34,400 

 pounds half power in pound yards; actual power in pound yards, 

 876. 



The power required, therefore, to subsoil three inches deep 

 was 352 pounds, or 117 pounds for each inch that was subsoiled. 



Mr. Holbrook's Sod and Subsoil, going in one inch deeper and 

 taking a furrow three inches broader, absorbed 194 pounds less 

 of power than did this of Mr. Wheatley's. 



We were all very much pleased with the appearance of the 

 invention and we confidently expected that a trial would demon- 



