PLOUGHS AND PLOUGHING. 



707 



particular construction are used locally in many districts, where the 

 orthodox turn-over mould-board has not been found to suit the land so 

 well ; but there is great probability that the new type of digging-breast 

 will supersede them, though perhaps only gradually. There are several 



Fig. 251. Rectangular Furrow, 

 Unbroken. 



Fig. 252. Crested Furrow, 

 Unbroken. 



forms of furrow turned, of which the rectangular (fig. 251), the crested 

 (fig. 252), and the wide broken furrow (fig. 253), are the most general. 



As the soils of farms are of various kinds, ploughs are correspondingly 

 diversified in their construction, and in the purposes to which they are 

 applied. We have only space to notice a few of the implements that 

 are most deserving of attention. 



Fig. 253. Wide Broken Furrow. 



The ploughs in most frequent use are wheel ploughs, and swing ploughs, 

 the latter being not provided with wheels. 



It is necessary to set the plough so that it runs evenly on the slade, 

 and unless it is desired to make the crest very high, as in the trapezoidal 



