STRAW CUTTERS. 



Pig. 85. 



76 



Hide Boiler Straw Chi Iter, 



CHAPTER y. 



APPl^ICATION OF MECHANICAL PRINCIPLES IN THE 



STRUCTURE OF SIMPLE IMPLEMENTS AND 



PARTS OF MACHINES. 



In contriving the more difficult and complex machines, 

 the principles of mechanics must be closely studied, to 

 give every part just that degree of strength required, and 

 to render their operation as perfect as possible. But in 

 making the more common and simple implements of the 

 farmer, mere guess-work too often becomes the only guide. 

 Yet it is highly useful to apply scientific knowledge even 

 in the shaping of a hoe handle dr a plow-beam. 



The simplest tool, if constantly used, should be formed 

 with a view to the best application of strength. The 

 laborer who makes with a common hoe two thousand 



