SEEDING MACHINERY 



III 



hoes are provided with break pins or spring trips 

 in order that they may not be broken when striking an 

 obstruction. These trip devices resemble very much 

 those used upon cultivators. The hoe drill has good 

 penetration, but clogs badly with trash. It is used 

 extensively as a five-hoe drill for drilling in corn 

 ground between rows of standing corn. 



147. The shoe drill came into use about 1885 and has 

 many advantages over the hoe drill. In fact, it was used 

 almost entirely until the more recent development in the 

 nature of the disk drill. Fig. 83 illustrates a shoe drill 

 with high press wheels. The shoes are pressed into the 

 ground with either flat or coil springs, which permit an 

 independent action and prevent to a certain extent clog- 

 ging with trash. It is claimed that flat springs do not 

 tire as readily as coil springs, but coil springs seem to be 

 almost universally used. 



FIG. 83 A LOW-DOWN PRESS DRILL WITH SHOE FURROW OPENERS 



