Another String Trick
Stick a penknife into a post or tree, or other strong upright of wood, and pass a piece of string behind the post and above the knife, as in [Fig. 38]. Bring the end C round the post and pass B over it. Bring C round again and cross it over the knife, and B round the knife over C, as in [Fig. 38a]. Pass the ends round the post again, always remembering that B must be over C, and then tie the two ends in a knot, as in [Fig. 39].
Fig. 38.—Knife and string trick—first stage.
Fig. 38a.—Knife and string trick—second stage.
Fig. 39.—Knife and string trick—third stage.
By removing the knife from the post, you will now find that the whole loop comes away intact, having never really been passed round the post at all.