108 



Report on Trials of Plows. 



The following extracts from his specification, will explain his 

 ideas: 



" The mould-board of cast iron, Fig. 67, from the extreme 

 points of the length of the mould-board, from a to bo. straight 



line is to be struck from one to the other of six inches and one- 

 eighth in length, and from the middle of this line a perpendicular 

 is to be let fall to the surface of the mould-board, which will l)o 

 five-sixteenths of an inch. A line is now to lie struck from the 

 point c, which is to be at the commencement of the thin edge of 

 the mould-board to the point d^ placed at the shoulder on the 

 under side, for the reception of the extreme edge of the back of 

 the share of two and five-eio;hth inches in leng-th. From the lettei- 

 d to a. a straight line is also to be struck of four and five-sixteeni h 

 inches in length; a perpendicular, let fall from the centre of tlii.s 

 line to the surface of the mould-board, will be full three-eighth 

 inch in length, and from said point c to the hinder circular edge 

 of the mould-board, seven-sixteenths of an inch. From the point 

 'I, to the pointy, a line is drawn of four and seven-sixteenth 

 inches in length, and a perpendicular raised from the centre of 

 this line to the top of the circular jjart of the upper edge of tlu? 

 mould-board will be a full quarter of an inch in length. From 

 the lettery to the letter b on the front edge of the mould-board 

 a line is to be struck of two and three-quarter inches in length, and 

 from the centre of this line a perpendicular let fall on the front 



