FARM MACHINERY 207 



plow a furrow in the bottom of the furrow made by the first. 

 In this way it is entirely possible to plow to a depth of 16 

 inches or even more. The disks are large and they do 

 the best work when cutting a furrow 12 inches wide. 



The draft of this tool is surprising. When tested in a 

 loam soil with a clay subsoil, the draft, when plowing a 12-inch 

 furrow and 16 inches deep, was between 800 and 900 pounds. 

 A 16-inch sulky plow when forced to its capacity for depth 

 (eight to nine inches) gave a draft between 900 and 1000 

 pounds, or about 100 pounds more. By comparing the 

 sizes of these various furrows it is to be noticed that the draft 

 of the tilling machine was very satisfactory. Again, it would 

 be quite impossible to plow so deep with anything except a 

 special plow of this character. 



Hillside and Reversible Plows. The hillside plow is 

 a reversible plow adapted to a field with so much slope that 

 it would be quite impossible to throw a furrow uphill. The 

 plow is changed from a right-hand to a left-hand plow by 

 revolving the plow so that the furrow is turned either to the 

 right or to the left. 



The reversible plow was formerly confined to the hillside 

 type, yet there is a tendency at the present time to make a 

 more extended" use of 

 this type of plow. Its 

 use in the irrigated 

 sections, where dead 

 furrows are to be avoid- 

 ed if possible, is of 

 great importance. The 

 advantage of dispens- 

 ing with dead furrows 



£ U J +U Fig, 117. A reversible disk plow. This 



in any nelU, and. tnUS plow is made to turn a right or left fur- 

 i • ii r row by swinging the hitch from one end 



leaving the surface t0 the other 



