40 Rerort on Trials of Plows. 



b, c, terminates in a palm, ef, by which it is bolted to the beam. 

 The arm, c, is furnished, besides, with an oblique palm or ear, gr, 

 upon which the fore edge of the mould-board rests and to which 

 it is bolted. The sole bar, a, with its flange, terminates forward 

 in the head, h, which is here made to form the commencement of 

 the twist of the mould-board, and upon which the share is fitted, 

 reaching to the dotted line, zi, Fig. 29. The fore edge, kil, of 

 the frame is worked into the curve, answering to the oblique sec- 

 tion of the fore edge or breast of the mould-board, and serves as 

 a support to the latter throughout their junction. The curvature 

 given to the arm, 5, is unimportant to the action of the plow, but 

 the general oblique direction here given to it is well adapted to 

 withstand the thrust constantly exerted in that direction when the 

 plow is at work. In Fig. 30, the sloping edge, d m, represents 

 the enlargement of the sole bar on which the share is fitted and 

 where the lower part of the fore edge of the mould-board rests. 

 The depressed portion, m n, is that which is embraced by the 

 flange of the share. In the frame, o, is the lower extremity of the 

 right handle broken ofi" at o, to show the manner in which it is 

 joined to the sole flange of the frame by the bolt, p. The bolt 

 holes, q q, are those by which the beam is secured to the palms 

 of the frame; r r are those by which the land side i^late is attached, 

 and s s those of the sole shoe, t, being that which 

 secures the mould-board to the ear, and u that which 

 receives the lower stretcher of the handles. (See 

 Fig. 50, Plate II, at F and O.) The letter v marks 

 the second bolt hole of the mould-board, while its 

 third fixture is effected upon the right handle by the 

 ^S intervention of a l)];acket, or of a bolt and socket as 

 seen at o, Plate II. The curved lines, to w, mark the 

 position of the beam when attached to the body, 

 the beam being received into the seats formed on the 

 land side of the palms, <?, /, as seen more distinctly at 

 ^ w m h\g. ol. 



The body frame being an important member of the implement, 

 regard is paid to having it as light as may be consistent with a 

 due degree of strength; hence, in the different parts breadth has 

 been jriven them in the direction of the strain, while the thickness 

 is studiously attenuated in such places as can be reduced with 

 safety. The least breadth of the sole bar, «, is three and three- 

 quarter inches, of the arm, c, four and one-half inches, and of 5, 



