94 Farmers’ Bulletin 1223. 
breaks up clods and prepares the way for the smoothing section. 
To the back edge of this fourth plank is rigidly attached a smooth- 
ing drag consisting of two sections of 2 by 12-inch plank 4 feet long - 
cleated together by 2 by 4-inch crosspieces near each end of the 
planks. To the underside of the fourth plank of the clod crusher 
is bolted the flanged base of the iron fence post, so placed that the 
two edges of the angle iron straddle the crack between the two 
smoothing planks, to each of which the iron is securely attached. 
Two strips of iron anchor the two portions of the drag together, 
supplementary to the angle iron. Holes are bored in the front 
plank of the clod crusher for the attachment of a wire anchor for a 
singletree for the attachment of one horse. 
Fic. 13.—Dust path made by groove drag. 
Equally efficient modifications of the groove drag shown in the figure 
have been made by substituting 14 inch for 1-inch angle iron, and 
1-inch boards for the 2-inch planks in the back or smoothing section, 
the two sections being fastened rigidly together. Angle iron with 
2-inch sides is not satisfactory. One-inch smoothing boards are 
quite as satisfactory as 2-inch planks, although they are not likely to 
be durable. An absolutely smooth finish to the undersurface of the 
rear section of the drag is most necessary so that it will not catch 
and will produce a perfectly smooth impression. Not only must the 
boards be perfectly smoothed off, but the front end of the angle iron 
must be flattened and smoothed, and the bolt heads in it completely 
countersunk. 
The groove drag improves the soil surface wherever used. Its 
width is such as to permit its use between rows of corn, thus segre- 
