Vibration and Waves

Big Feather

The big feather is one of the most fascinating exhibits, to visualise waves. With the help of one handle you can bring the eight metres long feather out of steel wire into transversal or longitudinal vibrations. On the feather you can watch the spreading and the interference from waves. With a little exercise it succeeds, that you can create upright waves (fundamental oscillation, harmonics) with a big amplitude. So, the horizontal rashes of the feather, amounts up to one metre per side.

Chladni Plates

The vibrations of plates are examined by Ernst Florens Friedrich Chladni in 1787. With a violin bow you stroke over the rand of the plates. Spread grains of sand can make the vibration of the plate visible: there are areas with hard vibrations, the so- called vibrancy bellies. There, the sand is whirled up. And there are areas, in which the plate does not move at all, the vibration node.  There the grains of sand are collected. When the plate is set in vibration is held at a different point, it results another sound or another vibrancy image.

Hearing Balls

The hearing balls are different sized hollow bodies, which have, by their volume special resonance frequencies. When there are the same or similar frequencies in the ambient noises, the acoustic oscillation swings up, so the listening visitor perceives the sound spectrum intensified.

Seismic Sand

When you knock from below against the round container, there appear ring- and cross shaped rills in the sand. The sand vibrates by the knocking and forms different patterns, which make the vibrations visible. The patterns relate to the size and form of the container, also by the sand and the air.

Sound Wheel

Radius music can be very manifold. By the attempt to make different mechanic tensions audible, the sound wheel resulted. The by the stop created vibrations are strengthened that good by the wooden block, so with the rotating wheel occurs a perennial melody.

Whirlwind

They are admired multiplicative: Those humans, who can form the smoke from a cigarette into a swirl, which spreads over a number of metres through the room. In the experiment “whirlwind” everyone can make such a swirl and watch, which effect it achieves in a few metres. The friend can feel them immediate and a candle- also set in a few metres- goes out, when the swirl reaches it. There it is less the size of the power significant, but the exactly focus on the goal.