244 Report on Trials of Plows. 



moiild-])oard plow cast in two pieces, viz.: the point and shares, 

 and the win<>;s or mould-boards. The beam is of oak, and is 45 

 inches long. The wheel, which is attached in the same way as 

 Gov. Holbrook's, which we have already described, is 7 inches in 

 diameter and 2 inches broad. The clevis is the same also as Gov. 

 Holbrook's. A pair of cast iron arms rise from the upper edge 

 of the mould-boards on each side, 9 inches to the rear of the 

 breast, in a curved direction towards beam and bolt, through its 

 heel. These arms descend six inches, and are flanged below. From 

 these flanges a box is supported in which are inserted the gudgeons 

 of the driving wheel, which can be raised or lowered at pleasure. 

 The driving wheel is 11 inches in diameter and 1 inch wide. 

 Two pins are inserted on each side of the driving wheel, which 

 strike on cones which communicate a vibratory motion to the 

 slides, which open the valves for the deposit of the seed. By 

 increasing the pins, the quickness of the viljrations and conse- 

 quently the amount of seed sown is increased ; by diminishing 

 the numl)er of pins, the quantity sown can be diminished. A 

 pair of hinged ears, 8 inches above the sole of the mould-boards, 

 project in the rear of the handles, from which brace-rods (half an 

 inch in diameter) extend backwards 12 inches to the covering 

 irons. Another pair of brace-rods extend from the first pair, at 

 the front of the covering irons, upwards to the handles. Eighteen 

 inches above the sole of the mould-board one end has a ring 

 which embraces the first pair of braces, and the other is bolted 

 to the handles. The covering irons are 1 inch apart behind and 

 9 inches apart in front, sloping to the right and left as they 

 descend to the ground. They are 14 inches long, and are curved 

 upward and backward from below. A rib is cast about the mid- 

 dle of the covers, 10 inches high in front and 2 inches high 

 behind, which flare outward. A pair of ears are cast about the 

 middle of the covers, to which a cross-rod is bolted, from the 

 centre of which a standard rises, which is surmounted by a cross- 

 bar; from the ends braces extend to the handles; on each side a 

 thumb-screw, on the top of the standard, regulates the depth of 

 the hill. A pair of eyes, 1 inch in diameter and ten inches apart, 

 are screwed into the top of the beam ; between these a wooden 

 roller is inserted, from the centre of which a wooden bar runs 

 laterally. A marker is placed at the end of this bar, which can 

 be moved backward and forward, and secured by a thumb-screw 

 at any point, so as to make the marks for the furrow at any 



