392 



SCIENCE OF AGRICULTURE. 



Part IT. 



tl>e seed covered, especially when they are permitted to move irregularly in a lateral di- 

 rection. Where the soil is already line, as it ought always to be before grass seeds are 

 sown, lighter harrows are used, which are so constructed, that all the ruts are equidistant. 

 2570. Tlie angular- sUled hinged harrow {fig. 322. ) is one of the best implements of 

 the kind, as it both operates on the ground with great regularity, and is less liable to 

 ride or be deranged in turning, than the common, or the rhomboidal harrow. 



322 



2571. The improved Scotch or rhomboidal harrow {fig' 323.), consists of two harrows 

 joined together ; they are generally made heavy <rsr^ 323 



or light, according to the purpose for which they are 

 intended, or the nature of the ground on which they 

 are to be employed. Iron rods are fixed in two 

 bulls of each harrovv, having hasps and hooks ; 

 by this means the harrows are connected, and the 

 same distance from one another is preserved, as that 

 between any two bulls in the harrow ; and though 

 the teeth are not placed equidistant from each other 

 in the bulls of this, as well ss in the bulls of tlie 

 old harrow, nevertheless, the teeth in this harrow 

 move in lines equidistant from each other, so that 

 not any two teeth of these harrows move in the 

 same track ; and, as they divide the surface into 

 equal small parts, the ground must be pulverised in 

 a more expeditious and superior manner, than can 

 f)e done by the old common harrow. This advan- 

 tage is obtained by forming the harrow not square, 

 but of a rhomboidal shape, the angle of which must be according to the number of the teeth. 



2572. The grass seed harrow is only a lighter construction of the rhomboidal harrow 

 or of any other approved form. 



2573. The brake or levelling harrow (fi^. 324.) is a valuable implement. It consists 



i'l U ^^ *^^ frames, the one trian- 



'.'S. gular and the other oblong. 



n JBy means of the handles, the 



oblong part of this brake can 

 either be raised up or de- 

 pressed ; so that when the 

 ground is cut in small pieces 

 by the teeth of the triangular 

 harrow, then the oblong har- 

 row following, its teeth being 

 pressed down into the high 

 parts, carry or drag part of 

 the soil off from the heights; 

 and when they are raised up 

 by the handles, leave that soil 

 in the hollow or low parts. By this means, the ground is brouglit nearly to one plain 



mn 



