64 FARM MACHINERY 



Some manufacturers make plows with interchangeable 

 moldboards, and sulky plows are usually built with inter- 

 changeable bottoms, so the plow or carriage may be used 

 .for a variety of soils. 



96. The jointer. The jointer is used in soils inclined 

 to be soddy. It enables the plow to do cleaner work and 

 cover all vegetation, throwing a ribbon-like strip of turf 

 into the furrow. It will often render excellent service 



FIG. 42 TYPES OF JOINTERS. THE TWO AT THE LEFT ARE MADE OF 



STEEL ; THE ONE AT THE RIGHT IS A CHILLED IRON JOINTER 



WITH AN ADJUSTABLE SHANK 



where sod ground is to be plowed deep and left in shape 

 for immediate pulverizing to fit it for crops. It will cut 

 out a section of the sod, turning it into the bottom of the 

 furrow, where it will be completely covered, and at the 

 same time leave the upper edge of the furrow slice com- 

 posed only of comparatively loose earth. By cutting out 

 the corner of the furrow slice, the furrows will be com- 

 pletely inverted, leaving the surface smooth. If the fur- 

 row slice is perfectly rectangular, the furrows are inclined 

 to pile or lap over each other. 



