THE PRINCIPLES OF INTEUCULTURE 



199 



shovel plows, consisting of a very broad mold-board 

 shovel mounted on a beam, with handles to guide. Later 

 two narrower shovels were substituted for the single broad 

 shovel. Though this was an improvement, it was still nec- 

 essary to go twice in each row for thorough cultivation. 



Fig. 64. — Spring-tooth attachment. 



Fig. 65. — Shovel attachment. 



Fig. 66. — Cut showing 

 angle and tilt adjustments. 



Later two of these double shovel plows were rigged on a two 

 wheel sulky, thus enabUng the operator with two horses 

 to cultivate both sides of a row at one time. The corn 

 cultivator is still built essentially on this principle with 



