238 Report on Trials of Plows. 



of the feather is 12 inches, measured at right angles with the 

 exterior face of the land side. There is no marked line of 

 separation between the point and the rest of the share; its breadth 

 is one-half an inch. The edge of the feather from the point to 

 the angle is regularly concave on the sole. The length of the 

 chord connecting the point Avith the angle is 19| inches, and the 

 longest ordinate to the curve is three-fourths of an inch. The 

 distance of the angle from the bottom of the mould-board is 5|^ 

 inches; it is brought to a cutting edo;e alono^ the sole for its entire 

 length, and does not vary anywhere from the plane of the sole. 

 The vertical height of the breast at the junction of the share and 

 land side is 4 inches, and at the standard 10 inches. The length 

 of the share on the land side is 10| inches. The upper edge of 

 the share coincides with the lower edge of the mould-board in a 

 straight line. An iron plate three inches wide is applied along 

 the line of junction on the inner face and unites the two by 

 means of two bolts passing through the phxte and the upper edge 

 of the land side, and two through the lower edge of the mould- 

 board. 



The Standard 



Is of wrought iron, 2| inches wide and 'three-quarters of an inch 

 thick; it is straight until it reaches the breast of the plow; it 

 then curves forward to correspond with it. It twists inward 

 Avhen it meets the land side and has a gain cut in the lower end 

 to receive the land side plate which is bolted to it; it terminates 

 above in a plate six inches long and three inches wide, having 

 transverse slots cut at each end, through which bolts pass upward 

 through the beam secured by nuts upon its upper surface. By 

 this arrangement the angle made by the beam and the plane of 

 the land side may be varied at pleasure. The land side is per- 

 pendicular to the sole for six inches; from thence upward the 

 standard inclines to the furrow side; at 12 inches above the 

 sole it deflects three-fourths of an inch. A line drawn from 

 the point to the top of the breast where it meets the standard is 

 19i inches, and the longest ordinate to the curve of the breast is 

 1| inches. 



The Mould-Board 



Is of cast steel, which is three-eighths of an inch thick. It has 

 straight transverse lines, but its vertical lines are concave. We 



