Coins on a cord

1. Coins on a cord

2. Objective: • Without untying the large knots, put the two rings together on the same side of the central hole. When that is accomplished, reverse the process and restore the starting position where the rings are separated.

3. Components: Two ancient Chinese coins (simulated), a cord and a small wooden block with three holes.

4. Construction: 1. Double the cord and push the loop at the closed end through the large hole at the centre of the wooden block.

5. Construction: 2. Pass the open ends of the cord through the loop.

6. Construction: 3. Pass each open end of the cord through the hole in a coin.

7. Construction: • Through a small hole near the end of the wooden block, and tied a large knot on the other side of the block.

8. Solution ： Put together • Begin with the central loop lying in front of the bar, as in this figure. Pull the loop toward you.

9. Solution ： Put together • Slide the left ring up the cord, and pass it through the central loop.

10. Solution ： Put together • Keeping the ring in place, pull the left and right sections of the cord toward you through the hole in the bar by tugging the central loop.

11. Solution ： Put together • Slide the ring along to the right and through the two central loops that are now at the centre.

12. Solution ： Put together 5. Pull the central loops back through the hole.

13. Solution ： Put together 6. Let the ring slide onto the right-hand section of the cord. Readjust the lengths of the cord on the two sides of the puzzles so that they are equal. Make the corresponding movements, but working from right to left, to transfer the ring back to the left cord.

14. Solution ： Separate Just reverse the process of put together. 1.

15. Solution ： Separate 2.

16. Solution ： Separate 3.

17. Solution ： Separate 4.

18. Solution ： Separate 5.