How to Amaze people by a Cylindrical Tube and Thread-The Pulley Principle

A tube is raised in air just by passing a thread between it. It’s amazing to see how the tube rises when the two ends of thread are tighten vertically.Okay lets start how it works-

Overview-A long cardboard tube is shown threaded on a still longer string. One end of the string is held upward, and the tube is allowed to slide downward to the other hand. There is nothing phenomenal yet, but wait! At the world “Rise!” the tube mysteriously ascends the string almost to the top. It repeats this, falling and rising, as often as desired.

Materials-A cardboard mailing tube, 18 inches long, 1.25 inches in diametrer. A string, 36 inches in length. Another string, 22 inches in length. (All Dimensions approximate.) A small curtain ring of less diameter than the tube. A thumbtack.

What to do in real- Tie the ring to one end of the short string and drop it down through the tube, so it just barely emerges at the lower end. Lay the tube flat and push the thumbtack just inside the lower rim of the tube, so that the tack points outward. Tie one end of the long string around the heeds of the thumbtack. Push the other end of the long String as far through the ring as it will go.

Now, take the end of the short string at the top of the tube and draw it upward until the ring is hidden inside the lower end of the tube. Hold the end of the short string with your right hand and take the free end of the long string with your left hand. Draw the ends of the strings taut, then li9ft the tube upright, your right hand above, your left hand below.

You will find that the tube hangs steadily near the top of what appears to be a single string more than twice the length of the tube. This is the way you show the tube and string to start, So it is good plan to grip the top of the tube by bending one or two fingers inward and pressing the rim of the tube against the right palm, As if you were holding there tube in place.

Relax the left hand’s hold on the lower end of the supposedly single string and the tube will slide down nearly to the bottom as it presumably should. Then pull the ends strongly and the tube will rise to the top, apparently of its own accord. It can be made to fall and rise as often as you want; and it can be stopped halfway by simply keeping the strings taut instead of pulling them or relaxing the lower end.

What happens in real- It is a simple illustration of the pulley principle, with the long string hoisting the tube, just as pulling the end of a doubled rope raises a weight on the other end. If done openly. There would be no mystery, but the tube conceals the block-and-tackle arrangement which is responsible for the lift .Here, Science is strongly applied to create a baffling illusion

Conclusion: The supposedly single string becomes shorter each time the tube is raised, and it lengthens whenever the tube is lowered. This, however, is not noticed, due to the length of the tube itself. A shorter tube can be used, with the strings proportionately shorter, but the extent of the rise necessarily will be reduced and the experiment will be less effective.

"Tube is nothing just a hollow-By T.D"

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