58 Report on Trials of Plows. 



may fill the lines of the pattern. The farther end of the block 

 being: set in like manner to face within the lines, it is to be firmly 

 attached to the board by screw nails. The second block, k i, is 

 to be joined to the first by the ordinary method of glueing, being 

 set in the same manner as the first, to fill the lines of the pattern 

 at both ends, and this requires its being set obliquely to the first. 

 The third block, I m, is set in like manner, and so on with ?i 

 and^ q. The setting of the diflerent blocks will be much facili- 

 tated by having the ends, g i I n p, cut ofl' to the plane of the 

 land side, that is, to coincide vertically with the land side edge 

 of the board, and by keeping in view that the terminal line lies 

 at an angle of 45 degrees. 



The block being thus prepared, the process of ivorldng it off is 

 plain and easily performed in this way : Having set the bevel at 

 the angle, b a m^ Fig. 126, which answers to the end, a b, of the 

 block, the bevel is applied as in the figure, and the surplus wood 

 is cut away to a short distance within the end, a b, of the board, 

 until the blade of the bevel lies evenly upon the surface, and the 

 kneed head-piece touching the edge of the board. Set the bevel 

 now at the angle, b a I, and, applying it at the first division on 

 the edge of the board, cut away the surplus wood with a gouge 

 or other tool, in a line parallel to the end of the board or at right 

 angles to its edge, until the edge of the blade, af, lies evenly on 

 the surface, and the head of the stock touch the edge of the board 

 as before. Repeating this operation at each successive division 

 with the bevel, setting it to the corresponding angle up to the 

 zero or vertical line, and we have a series of leading lines oi- 

 draughts, each occupying its true position on the surface of the 

 mould-board to the height of the line of transit. By continuing 

 these lines, each in the direction already given it, until they 

 terminate in the breast or in the upper edge of the pattern, we 

 have a corresponding series of points now determined in the 

 breast and upper edge; and by removing the surplus wood still 

 remaining in the spaces between the lines, and reducing the 

 surface to coincide with them, we have the fiin'shed surface from 

 the neck of the share up to zero. 



To complete the after portion of tJie pattern, we have to forui ii. 

 temporary bevel with a curved blade adapted to the small arc, 

 a t, fig. 126, Plate IV, which blade is prolonged in a tangent, t n, 

 at the anHe of 45 deo;rees. With the o-uidance of this bevel, its 

 stock being still applied to the board as in Fig. 129, cut away all 



