FARM MACHINERY 



213 



Fig. 121. A spring-tooth harrow. 



The Spring-Tooth Harrow. The spring-tooth harrow, 

 with flat spring teeth bent almost to a complete circle, is a 

 tool that is not in general use in America, but implements 

 of a similar character are used to a large extent in Europe. 

 It should be classed as 

 a cultivator rather than 

 a harrow. It is adapted 

 to hard, compact soils 

 which require a tool of 

 good penetration. The 

 teeth have such long 

 blades with so much 

 spring that the machine 

 is not damaged in passing over stones or low stumps. 

 The draft of a spring-tooth harrow will depend upon the 

 adjustment given to the teeth, but under average condi- 

 tions it greatly exceeds that of a smoothing harrow. 



The Harrow Cart. Probably there is not another imple- 

 ment attachment that can be bought for the same money that 

 will dispense with so much hard labor as the harrow cart. To 

 be a satisfactory device it must be rigidly built with angle or 

 U-bar arms extending to the harrow evener, with provision 

 for the cart wheels to castor in turning. The wheels should 

 be high, 32 inches being a good height, and provided with 

 tires about three inches wide. They should also have dust- 

 proof removable boxes with easy means of lubrication. 

 Lastly, it should not be overlooked that the cart should 

 be provided with a comfortable seat and springs to support it. 



Utility of the Disk Harrow. The disk harrow is an 

 implement well adapted to deep surface cultivation. For 

 this reason it is used for a variety of purposes. To prepare 

 plowing for seed in the spring or stubble for plowing in the 

 fall, it is equally useful. For covering broadcasted seed in 



