Simple Wheat Buhher. 401 



which is cut in large grooves ; it is made of three or 

 more square pieces of wood doweled together, in the 

 centre two iron boxes are phiced, to receive the axle ; 

 C, an axle nine feet long, one end of which passes 

 through the wheel, having a whirter fastened on the 

 under side, also a washer and lince pin ; the other end 

 has a mortise or notch cut in it to receive the curved 

 ^^^t of a plank marked D ; this plank is live feet in 

 length, by one and a half inches in thickness, and is 

 fixed horizontally in a notch cut in the side of the up- 

 right shaft, and made fast by a wedge on the upper 

 side. The part marked E, is seven feet long, one end 

 of which is fixed in a mortise in the upright shaft so 

 loosely as to admit of the wheel rising at least one foot 

 from the floor, the other end is fastened to the under 

 side of the axle near the wheel, by an iron pin through 

 both ; by this means the end of the axle may be re- 

 moved to any part of the curved edge, and may be fix- 

 ed by a pin at pleasure. The piece marked G, is add- 

 ed for convenience in fastening a horse to the machine, 

 one end being fixed in the upright shaft ; it is sup- 

 ported a proper height from the floor by a brace mark- 

 ed F, and is connected with the axle by a chain seen 

 in the plate. 



The above dimensions are given for a machine to 

 work on a floor twenty feet square ; for a larger or 

 smaller floor the dimensions of the machine should be 

 proportionally increased or diminished in all its parts. 

 In order to use this machine to the best advantage in 

 threshing grain, the straw should be unbound and 

 thrown around the upright shaft, and the end of the 

 axle drawn backward to the end of the curved edge ; 



VOL. III. E 3 



