234 Report on Trials of Plows. 



meiit the mould-board can be readily changed from a sod to a 

 stubble plow, and vice versa. The dog, D, hooks into (7, Fig. 

 115, and into i, Fig. 116. The rod, E, hooks into h, and the 

 nutted end passes through the hole in the middle of the dog, 

 which braces all parts firmly together. 



While we have been compelled by the results of the trial to 

 give a very decided preference to the Holbrook plow, we intend 

 to bestow a strong commendation upon its competitor, which is 

 in all respects a very excellent plow, though not as well adapted to 

 deep plowing as Holbrook's. The material of which it is made 

 is the hardest and least frangible steel that ever came under our 

 notice. This was very strikingly exemplified, when a stone two 

 feet lonof, eifi:hteen inches wide and three inches thick was caught 

 between the revolving cutter and the breast of the plow and torn 

 out from ten inches beneath the surface of the ground. The 

 cutter was pressed by this operation fully three inches to the 

 right of its natural plane, but when released it sprang back to it 

 again without injury to it or to any part of the plow. 



We know nothing of the process by which these desirable 

 properties are imparted to the steel, but we can fully testify to 

 the excellence of the article. It pulverizes the ground remarka- 

 bly well for a concave plow, and buries the weeds and stubble 

 tolerably well. In our opinion it would be better if it were 

 longer and less abrupt; and we think the breadth from the land 

 side to the angle of the feather on the share is too great, as it 

 does not leave a hinge sufficiently wide for the furrow slice to 

 turn in. We give the following full description of it: 



Turf and Stubble Plow C No. 3. Collins & Co., Hartford. 

 F. F. Smith, Patent. Class IV, Entry No. 13. 



This plow is of cast steel, with the exception of the standard, 

 which is of wrought iron, and the bolts and brace rods, which 

 are also of wrought iron, and the bridle, which is of cast iron; 

 the beams, handles and one cross-brace are of wood. 



General Dimensions. ^ , 



Inches- 



From zero to rear end of mould-board 4^ 



From zero to heel of land side 5 



From zero to first cross-brace 5 



From zero to second cross-brace 101 



From zero to extreme tip of left handle 33 



From zero to rear edge of standard 85 



From zero to rear corner of fi-athoi- 12 



