A Frame,
on the pattern of C, E, D, G ([Figs. 133 and 134, Chapter XIV.]), and about half the height of the platform (see L, M, N, Fig. 138).
Erect this frame in front of the platform, and at such a distance from it as will allow your longest boards to span the intervening space, as in Fig. 138. Nail two diagonals—one at each top end of the frame M, L, N, and fasten the opposite ends of the diagonals to the bottoms of C and D.
Long boards may be laid from the ground to the top of M, N, L, and nailed securely to the frame, and other boards laid over the upper ends of the first, and the top of E, where they can be securely nailed, and the slide is ready for use.