THE YOUNG FARMER 



tools can be afforded, the spring tooth may 

 be a better tool to buy than either the disk or 

 the spike-tooth, although it is not for certain 

 purposes as efficient as either of the others. 

 The kind of machine should obviously be 

 adjusted to the conditions, as, for example, 

 the size of the farm, and the character of the 

 farming. Riding plows may be desirable 

 on level land, but where it is necessary to 

 plow up and down hill, walking plows 

 should be used. The extra weight of the 

 wheel plow is not a serious matter on level 

 land, because the sliding friction has been 

 transferred to rolling friction, but no 

 mechanical device has been or can be in- 

 vented which will decrease the power 

 necessary to raise a given weight a given 

 height. The various machines requiring 

 horse power should be adjusted, as far as 

 possible, to require the same number of 

 horses. If the main unit is three horses, 

 then, as far as possible, all machines should 

 require three horses, such as plows, harrows, 

 manure spreaders, harvesters, etc. If the 

 activities of the farm are sufficient to require 

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