FARM MACHINERY AND IMPLEMENTS 163 



AN ADJUSTABLE SMOOTHING HARROW. 1 



Mold-board plows are made in sizes ranging from 6 inches to 18 inches. 

 The 12 and 14-inch sizes usually prevail. Where larger plows are needed 

 gang plows are substituted. A gang plow of two 12-inch bottoms will turn 

 25 to 26 inches of soil at one passage of the plow and generally requires four 

 good horses. It is essential to have the center of draft fall directly back of 

 the center of the team, otherwise there will be a side draft that will increase 



SPRING-TOOTHED HARROW. 1 



1 Courtesy of The International Harvester Company, Chicago, 111. 



