64 



BOARD OF AGRICULTURE. 



will be equal to the number of teeth. Tlie teeth are made of 

 the best Swdes' iron, steel pointed. The harrows are of various 

 sizes and weights, containing 14, 18, 22, 26 and 30 teeth. 



Another form of the harrow is represented in the rhomboidal 

 or hinged harrow. The rhomboidal form is one of the few 

 instances of improvement on the principles adopted by the 

 ancients for tlife manufacture of this implement. 



It consists of two pieces of frame-work, connected by iron 

 hinges like barn-door hinges, which are bolted to each bar, thus 

 greatly strengthening the harrow. The harrow may be folded 

 or separated for the convenience of transportation or other pur- 

 pose. Either half may be lifted while the implement is in 

 motion. There are thirty teeth in the harrow, so that while 

 from their number and arrangement the ground is worked fine, 

 they are not liable to clog. This harrow is made heavy for 

 rough land and the pulverizing of sod furrows, or light for 

 grain and grass seed. 



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But a large class of implements of modern construction com- 

 bine, to some extent, the action af the plough and the harrow, 

 and are found to be of essential assistance in agriculture. 

 Among these are the grubbers, the horse-hoes, the cultivators, 

 and other implements of a like character. 



The horse-hoe is a valuable labor-saving implement, used for 



