Two Runners.
Set these runners side to side, on their long edges, and round off the angles with your plane, until the boards look like rockers (see Fig. 27). The side-boards must be exact duplicates of each other (Fig. 28).
Set the two side-pieces four feet apart and nail two or three temporary cross-pieces across their top (longest) edges to hold them in position; then turn them over and nail on the bottom-boards (Fig. 28).
You must use the greatest care in fitting the bottom-boards edge to edge, but you need not trouble yourself about the ends of the boards; allow them to project upon each side, as chance may direct. After the boards are all securely nailed to the bottom the ends may be sawed off flush with the sides of the scow (Fig. 29).