The Swivel Moldboard Plow is comprised of two plowshares; one positioned over the other. One plowshare rolls the soil to the right, while the other rolls soil to the left. Pivoting the shares at the end of each row enables the operator to create and work in only one furrow. This is a necessity when plowing across slopes, since the soil needs to be turned uphill for good results.
http://www.hy-tractors.com
Click image to view original image
