SEEDING MACHINERY 



123 



manner and offer some advantages in dropping uneven 

 seed. This style of drop is known as the full-hill drop. 



The cumulative drop was the result of an effort to raise 

 the accuracy of dropping. In the cumulative drop the 

 grains are counted out separately (a seed cell being pro- 

 vided in the seed plate for each kernel) until a hill is 

 formed, the theory of the accuracy being that there is less 

 chance for one less or more kernels when the cell is nearly 



FIG. QO THE ROUND-HOLE 

 SEED PLATE 



FIG. 91 THE EDGE-SELECTION 

 PLATE 



the size of each kernel, while in the larger cell three small 

 kernels could easily make room for the fourth. 



169. Plates. The round-hole plate is a flat plate with 

 round holes for seed cells ; hence the name. The round- 

 hole plate may belong to a full-hill or a cumulative drop 

 planter. 



The edge-selection or edge drop plate has deep narrow 

 cells arranged on its outer edge, in which the corn kernel 

 is received on its edge (Fig. 91). The arguments ad- 

 vanced in favor of this plan are that the corn kernel is more 

 uniform in thickness than any other dimension, and owing 

 to the depth of the cells is not so apt to be dislodged by 

 the so-called cut-off. The majority of planter manufac- 

 turers within the past few years have brought out an 



