92 FARM MACHINERY 



the five-tooth cultivators. Also a spring tooth may be 

 used similar to those used on the spring-tooth harrow. 



133. Features of cultivators, with suggestions in regard 

 to selection. The gangs (sometimes called rigs) are the 

 beams, shanks, and shovels. Usually several styles of 

 gangs may be fitted to each cultivator. The shovels may 

 vary in number from four to eight for a pair of gangs. 

 The larger number is to be preferred for producing the 



FIG. 64. FIVE- AND ELEVEN-TOOTH ONE-HORSE CULTIVATORS. EACH HAS 



A LEVER FOR VARYING THE WIDTH, AND ALSO GAUGE WHEELS. 



ONE HAS A SMOOTHING ATTACHMENT 



proper tilth of the ground, but are very troublesome in 

 being easily clogged with trash. The six-shovel gangs 

 are very popular for corn culture. The eight-shovel 

 gangs may have each set of four shovels arranged either 

 obiquely or in what is called a zigzag. Best cultivator 

 shovels are made of soft-center steel. They are made of 

 almost any width, and may be straight or twisted. The 

 twisted shovel has a plow shape designed to throw the 

 dirt to one side or the other, while the straight shovel 

 must be adjusted on its shank to do this. The beam may 

 be made of wood, steel channel, flat bar, or pipe. The 

 wood beam is somewhat lighter, but not so strong or 



