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The drive part of Hand-crank Bururu is made electric. It was made lighter and smaller , easy to carry at any place for disaster prevention education activities.You can use him anywhere with a rechargeable battery. Moreover, frequency can be freely adjusted between 1Hz to 8 Hz. He can demonstrate various experiments. （Here is a catalog） |
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| Experiment animation (Click on any icon to see an animation) | ||
 The effect of a week 1st floor. |
 The effect of oscillation frequency's change. ( 2Hz→2.5Hｚ→3Hz→Hz→4Hｚ→5Hz) |
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| There are few walls on the 1st floor, and besides these are weak. Therefore, during a earthquake, the damages will be focused on the 1st floor leading to the building collapse. | When the oscillation period of the building match its natural period, shakes will be amplified. And you will be able to observe a phenomenon called "resonance". | |