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The project was realized with the support of European Regional Development Fund and Széchenyi 2020.

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Jacob’s Ladder (Musical Plasma-arc)

Jacob of the Bible saw a ladder in his dream that reached the sky from the earth. This is where this spectacular demonstrative instrument got its name from.

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How to use?

Press the button! Wait what happens, then repeat it again!

What happens?

We extended the outputs of a high capacity transformer as electrodes. When pressing the button, we can generate upwards moving sparks between these electrodes; the sparks are driven up by the hot air. Moving away from the transformer, the distance between the electrodes slightly widens, thus we may see more and more longer plasma-arcs between them – these constitute the steps of Jacob’s ladder. The phenomenon is very spectacular in itself but not many people know that the plasma-arc is also able to “play” music.