1721. The snow plough (fig. 355.) is made with two pieces of board about eight inches wide, and two feet long, nailed together as if to form the end and side of a box. A common road-scraper, made of wood, is put between the boards in the form of a triangle, or something like an arrow head, the end of the handle being placed at a sufficient inclination to enable the operator to walk erect. When used, it is pushed before the operator, who advances at a walking pace.