**Synchronization of Metronomes**

**What it shows:**

The "tick-tocks" of five metronomes will come into synchronization when weakly coupled together.

… Read more about Synchronization of Metronomes |

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The "tick-tocks" of five metronomes will come into synchronization when weakly coupled together.

… Read more about Synchronization of Metronomes |

The effect of length, tension, diameter, and kind of material on the pitch of a vibrating string is demonstrated. One may also show the harmonics of a vibrating string.

The sonometer is a long hollow wooden box along the top of which are stretched one or more strings rigidly attached to the box at one end, with provision at the other for changing their tension. If there is just one string, it's known as a monochord. The monochord illustration is from John Tyndall's book entitled *Sound*, (… Read more about Sonometer

A collimated beam of Cathode rays can be deflected by a magnetic field.

Play different notes by shortening the coil.

Waves reflecting from two surfaces can interfere constructively and destructively. In this case it is light waves that are being reflected at glass/air and air/glass interfaces. The interference produces a concentric ring pattern of rainbow colors in white light, or dark and light rings in monochromatic light.

Assembly of three gas discharge tubes and white light source for spectral analysis with diffraction gratings.

You can use a spherical blackboard for many things, including the teaching of geographical coordinates, as a model for a closed Universe, or simply as a mathematical shape.

In the non-Euclidean geometry of the sphere, a circle will have a circumference greater than 2πr and an area greater than πr^{2}. A triangle’s angles will add to more than 180°, and two parallel lines, called Great Circles, will converge.

A Universe with a density parameter Ω greater than unity will have too much mass to overcome its own… Read more about Spherical Blackboard

The redshifted spectrum of galaxies and quasars is due to an expanding universe and can be expressed as the ratio of the scale factor of the present Universe to that of the Universe when the light was emitted. You can think of this as the light being s-t-r-e-t-c-h-e-d as the Universe expands so it arrives with a longer wavelength.

A 50cm × 10cm strip of dental dam with a wave drawn on it, attached at one end to a post and the other end free to pull. A wooden dowel at the pulling end ensures an even… Read more about Elastic Light

Collection of 16 wooden models of orbital states S, P, D, and F.

Bernoulli's principle shows the velocity dependence of pressure in a fluid. Here, fast flowing air creates a zone of low pressure that holds a beach ball aloft.

Here we have a beach ball held in the air stream from a… Read more about Bernoulli Beach Ball

**Size**: from small [S] (benchtop) to extra large [XL] (most of the hall) **Setup Time**: <10 min [t], 10-15 min [t+], >15 min [t++] /span>**Rating**: from good [★] to wow! [★★★★] or not rated [—]

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