180 



Report on Trials of Plows. 



A much better and simpler plan for a trvo wheeled plow is given 

 in Plate V, in connection with the plows of Messrs. Ransome and 



Howard. It is claimed by many that 



there is an advantage in the use of two 



wheels, as the land wheel acts as a 



lateral gauge to the width of each 



furrow as well as to the depth, and 



therefore the uniformity of width, 



depth and angle of the furrow slice 



J^iff. S3. thus produced give a perfect form to 



the whole operation. The American form of the double wheel 



plow is given in Fig. 83. 



The usual form of the single wheel is shown on the side of 



the plow beam, in Fig. 84, and beneath it 



in Fis:. 85. In either case the wheel 



frame is clasped to the ^ 



beam in a manner that 



readily admits of raising 



or lowering the wheel to 



J^iff, 84: give the plow any desi- -F'/ff. 86. 



red depth of work; and when adjusted to a given point it is 



then made fast by tightening the clasp. 



THE COULTER. 



Fig. 86 shows the manner of inserting the coulter through a 

 mortise in the beam. It is secured by a wedge; the beam is 

 strengthened from splitting by a diagonal baud passing round it. 

 It is adjusted to the sidv. of the beam, as shown 



> 



Fig. 86. 



Fiff. 87. 



Fig. 88. 



in Fig. 87, by a diagonal clamp, which supports the front of the 

 coulter on the upper side, and the back on the lower side; the 

 ends pass through holes in an iron plate, and are fastened securely 

 by nuts. 



Fig. 88 is a form of the coulter in which a circular plate, 



