ROLLERS. 205 



sown and the field harrowed, the soil may be furrowed by 

 passing over it in the direction in which the water is to 

 flow upon it, a roller provided with corrugations upon 

 its surface, each of which leaves a small distributing fur- 

 row. See fig. 96. This roller may be made of cast iron 

 disks, 18 inches or more in diameter, and of such a thick- 



Fig. 95. SCBAPEB INVESTED. 



ness as may conform to the distance between the furrows, 

 or the disks may be made of sand and cement, forming 

 in reality artificial stone. The cement may be shaped in 

 wooden molds. These disks will have holes two inches 

 in diameter through their centers, through which an axle, 

 consisting of rolled-iron bar or shaft, may be placed. 

 The axle may be fixed at the ends in a wooden frame, 

 provided with a tongue for draft. By such a method of 

 construction sufficient weight may be secured to compact 

 the soil and make the furrows durable. Another form of 



Fig. 96. CORBUGATED BOLLEB. 



roller is shown at fig. 97. This may be made of circular 

 sections of oak plank, 30 inches in diameter, with others 

 placed alternately with these, of 36 inches in diameter. 

 These sections may all be independent of each other, but 

 it will be more convenient if they are in pairs or triplets ; 

 for the reason that it will be necessary to make these 



