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How does a parabola function?

Where is the focus located?

If water is in between, will it still function?

Are there other examples of parabolas

Can the WHISPERHILL be placed on every site?

Doesn't arise a teriffying loud nois if a ball hits the wall or when someone does scream loud?

Is your question not in this list? Please Email us

 

How does a parabola function?



PICTO-INSTRUCTION

PICTO-NON-INSTRUCTION





You have to make any noise or speak from within te focal point with your face directed to the wall. The sound will reflect against the curved parabola in a bundled parallel direction and will travel straight forward into the opposite parabola. All parallel sound waves will reflect against the wall into the focal point again. This is why you can communicate over a very long distance.
 

parabool speeltoestel

Where is the focus located?
At the WHISPERHILL the focal point is situated 2 feet from the top of the frame and with a distance of 6.5 feet of the wall.
 
If water is in between, will it still function?
Sound does travel over a longer distance if the surface is even.
A great water surface between the two hills is no problem.
 
 
Are there other examples of parabolas
In number of theaters, churches and arena's the parabola can be found.
Singers, musicians and actors who are standing in the focal point can be heard throughout the public. 
colosseum
Colosseum - Rome

klanksculptuur

Hagia Sofia - Istanbul

klanksculpturen

 

parabolic mirrors
Parabolas are also used for reflection of light.
Light is similar as sound a wave that can be reflected en due to the curve of the surface be
directed in any direction.  Light reflects the best against a mirror.
In a torch or car headlight is also a parabolic mirror, that bundles the light.
The bulb is situated exactly in the focal point. 
On a big scale it is utilized in a lighthouse.
Modern examples are solar generators or solar cooking.

parabool

solar cooking

parabool

 

Can the WHISPERHILL be placed on every site?

The WHISPERHILL can be situated in a variety of ways.
A few examples are given in the image below.
If you consider placement for a situation that is not shown below, you can always send us your question.
You can also download a A4 printable version of the image below.
 

Doesn't arise a terifying loud noise if a ball hits the wall or when someone does scream loud?

We can assure you that that does not happen because the resonance is muted by the contact between the wall, ground and soil.

Objects that resonate freely, like for example a bell, does sound much louder.
As soon as you touch a ringing bell with your hand the volume of the sound will disappear.
The contact between the parabolic wall, the ground and soil result in the same damping.
 

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