118 Report on Trials of Plows. 



of Messrs. Ruggles, Nourse &, Mason. It is strictly geometrical 

 in its construction, and it probably works with as little resistance 

 as any plow that was ever made. It turns over the furrow very 

 handsomely as well as evenly, and would secure the unlimited 

 approbation of an English plowman; but its pulverizing power is 

 somewhat deficient, and it therefore fails in what we consider one 

 of the most important functions of a plow. A view of all the 

 lines is given in Plate VIII. The patent for this method was 



granted in 1852. 



KJNOx's Specification. 



"To enable any one skilled in the art of plow-making to form 

 the mould-board of plows, according to my said invention, I will 

 first describe the mode of determinino- the form of the surface 

 of a pattern from which to mould and cast the mould-board of a 

 green-SAvard, flat-furrow plow intended for a twelve-inch furrow; 

 and I will then indicate the changes necessary to the production 

 of the required form for an old-ground plow, from which any 

 skillful plowmaker will be enabled to make the necessary change s 

 for plows of any other dimensions. 



" For making the pattern from which to cast the mould-board 

 of a green-sward, flat-furrow plow, I first determine the propor- 

 tions of the base by drawing a line, A a, diagram Fig. 1, which 

 represents the line of the land side, and at right angles to this I 

 draw another line, B b, on which I determine the breadth of the 

 base of the plow from the line of the land side to the heel, c, of 

 the mould-board, say twelve inches for a furrow of that breadth, 

 and this I divide into inches. I then draw two lines, D d and 

 E e, parallel with, and one on each side of, and at a distance of 

 twelve inches from, the line B b. I then draw a diagonal line, 

 F y, from the intersection of the line D d and A a, passing 

 through the line B b iit c (the heel of the intended mould-board), 

 and project the said line until it intersects the line B e at e, and 

 the plane of this line, B f, perpendicular to the base, at tlio 

 I'cquired height, to be hereafter specified, determines the iucli na- 

 tion of the upper edge of the working surface of the intendi'd 

 mould-board to the vertical plane of the line A a or laud side. 

 The distance of the point of the plow at //, from the line B b, is 

 determined by multiplying the length of the diagonal line, Bf, 

 in inches, from the point where it intersects the lines A a and 

 D d to the point of its intersection with the line B b, by an 

 equ;il nmnbcr of inclics, and (Icn dividing this product ))y the 



