On Threshing out Wheat by a Roller. 33 



the roller, and be driven well home. Then stretch a line 

 from one end to the other of the roller, on the pins, so 

 that the pins on the off end, should be marked at the dis- 

 tance of 11 inches from the roller, and at the near end. 

 at 8 inches ; then saw off the pins where thus marked, 

 and the Roller will be ready for the frame. The pins are 

 thus gradually shortened in order that the roller maybe fitted 

 for running in a circle. To the roller, is to be fixed a frame 

 made of any strong wood, projecting about a foot in front, 

 next to the horses, beyond the pins, and the same distance be- 

 hind. It must be secured by mortise, and tenon, and pins, so 

 as to be taken off when not in use. For preservation a small 

 roof must be made to cover .the roller. The frame may 

 be separated and put any where out of the weather. 



Such a roller will last until it is destroyed by dry-rot 

 The whole cost will be ten or twelve dollars. By boring a 

 hole in the centre, from end to end, and allowing the tim- 

 ber to become perfectly seasoned, before it is made, and 

 keeping it covered when not in use, it will last fifty years , 

 or more. The pins may become very dry, and drop out, 

 but they may easily be made fast enough by wedging with 

 wet straw. The iron axis at each end soonest becomes 

 loose, and is more troublesome than any other part of the 

 machine, for wooden wedges are not sufficient to hold it. 

 But when well made, and put in skilfully, it will continue 

 firm in green wood, several years, and longer in dry 

 After the timber is bored and well seasoned, an iron axis 

 to pass entirely through the roller, might be fixed im move- 

 ably, so as to remain good a life time. 



The above described roller is adapted to three horses. 

 The gradation of the pins is suitable to a yard of 80 or 

 ] 00 feet in diameter. 



