144 MECHANICS. 



excellent purpose, leaving the soil almost as smooth as a 

 garden bed. Tough and sound timber, only two inches 

 square, is used for the frame, and the teeth are five- 

 eighths of an inch square. 



The Morgan Harrow is an improvement of the Scotch 

 implement, slots being made in the hinges, so that each of 

 the two portions is capable of jDlaying freely up and 

 down, as the surface varies, and rendering the rear teeth 

 less liable to follow in the track of the preceding. The 

 draught-iron is made to slide on an iron arc, so that the 

 lines formed by the teeth are controlled at pleasure. It 

 is converted into a broadcast cultivator by inserting flat 

 teeth, the flat portion below being the same in width as 

 above, and pointing slightly forwards. These teeth pul- 

 verize the soil deejjly and thoroughly. They are success- 

 fully used for digging potatoes, operating like a large 

 number of potato-hooks, drawn by horses. 



The Norwerjian Harrow (fig. 153) is a new machine for 



riff. 153. 



Norweffian Harrow, kept from cloprginpt by hoo cylinders cf teeth 

 playing into each other. 



pulverizing the soil, which performs the work in a very 

 perfect manner, bj^ turning up, instead of packing down, 

 the earth. Two rows of star-shaped tines play into each 

 other, and produce a complete self-cleaning action, pre- 

 venting clogging even in quite adhesive soils. Its com- 



