手回しぶるる

　 It is Bururu developed first. It is possible to carry because it is in the attache case.
Furthermore,you can feel oscillating cycle by turning the crank handle.
Besides various experiments can be done. For instance, it is earthquake-proof, and is
aseismatic, and a vibration control, etc.
（The catalog is here. ）

Experiment animation (Click on any icon to see an animation)
The effect of a heavy roof (on the left side)	The effect of a weak 1st floor (on the left side)	The effect of a baseisolating device （on the left side）
The transverse direction force is proportional to the weight during en earthquake.If the roof is heavy,this force will be great.	There are few walls on the 1st floor and these are weak. Therefore during a earthquake, the damage will be focus on the first floor leading to the building collapse.	The shake of the building becomes small by an aseismatic device.
Change of a proper period by difference in mass. (light<=>heavy)	Change of a proper period by difference of height of center of gravity. (light<=>heavy)	Resonance. (Primary mode =>Secandary mode)
If the weight of a building changes, the oscillation period will also change. The heavier the building is the slower it vibrates.	If the height of a building changes, the oscillation will also change. The higher the building is the slower it vibrates.	Shakes are amplified when shaking at their "natural period" . Then you can feel the "Resonance" phenomenon.
Such an experiment can be done by using "Hand-crank Bururu".
The ground model	Liquidizing experiment model	Fall furniture experiment model
Vibration experiment concept chart