FARM MACHINERY AND IMPLEMENTS 719 



another. This form of harrow is adapted to stony land, for the destruction 

 of weeds, for a thorough loosening of the soil and for covering broadcasted 

 seeds rather deeply. 



Disk harrows are made in two forms: the full disk and the cutaway 

 disk. The former is most extensively used, while the latter is best adapted 

 to stony land and for light work. Double disks frequently combine both 

 forms. They provide for the use of large teams and increased rapidity of 

 work without increasing man labor. Disks of the several forms are used, 

 especially for pulverizing the soil. They should generally be followed with 

 a smoothing harrow. Disks are generally best adapted for preparing the 



A Corrugated Roller. 1 



seed-bed on fall plowing or early spring plowing. They are also extensively 

 used in preparing corn land for the seeding of spring oats without plowing. 

 The disks of these harrows should be kept sharp to do effective work. This 

 is especially true when there is trash on the surface of the soil. The depth 

 of disking is adjusted by the angle at which the disks are set. Levers are 

 provided for setting at different angles. A disk truck reduces the weight 

 on the horses' necks, and is generally advised. 



On most farms a combination of the three forms of harrows above 

 mentioned is advantageous. 



Under this heading should also be mentioned the roller and the drag. 

 The chief purpose of the former is to compact the soil and crush clods. 



1 Courtesy of The Dunham Company, Berea, Ohio. From pamphlet "Soil Sense." 



