TILLAGE MACHINERY 



57 



the landside bar, furnishing the wearing surface. When 

 used for old ground, the plow is usually constructed with 

 the bar welded to the frog, forming the foundation to 

 which the other parts are attached. Landsides may be 

 classed as high, medium, and low. 



. 35 STEEL PLOWSHARES. 

 THE UPPER IS THE SLIP 

 SHARE, AND THE LOWER THE 

 BAR SHARE 



FIG. 36 THE FORM OF THE 

 HIGH, MEDIUM, AND LOW 

 LANDSIDES FOR WALKING 

 PLOWS 



4. Frog: The foundation to which are attached the 

 share, moldboard, and landside. 



5. Brace. 



6. Beam : May be of wood or steel. The beam in a 

 wooden-beam plow is joined to the plow by a beam 

 standard. 



7. Clevis, or hitch for the adjustment of the plow. 



8. Handles: The handles are joined to the beam by 

 braces. 



9. Coulter: Classified as rolling, fin, or knife coulters. 



89. Material. While in the cheaper plows the mold- 

 board and share may be of Bessemer or a grade of cast 

 steel, in the best plows these and also the landside are 

 usually made of soft-center steel or chilled iron. The 

 beam is usually of Bessemer steel, while the frog may be 

 of forged steel, malleable iron, or cast iron. 



