Mech' Resonance
Mechanical resonance is the tendency of a mechanical system to absorb more energy when the frequency of its oscillations matches the system's natural
frequency of vibration (its resonance frequency or resonant frequency) than it does at other frequencies. It may cause violent swaying motions and
even catastrophic failure in improperly constructed structures including bridges, buildings, and airplanes a phenomenon known as resonance
disaster.
Various examples of mechanical resonance include:
* musical instruments (acoustic resonance).
* Most clocks keep time by mechanical resonance in a balance wheel, pendulum, or quartz crystal.
* tidal resonance of the Bay of Fundy.
* Orbital resonance as in some moons of the solar system's gas giants.
* The resonance of the basilar membrane in the ear.
* Making a child's swing swing higher by pushing it at each swing.
* A wineglass breaking when someone sings a loud note at exactly the right pitch
Earthquake machine
Nikola Tesla established a laboratory on Houston Street in New York at 46 E. There, at one point while experimenting with mechanical oscillators, he
allegedly generated a resonance of several buildings causing complaints to the police. As the speed grew he hit the resonance frequency of his own
building and belatedly realizing the danger he was forced to apply a sledge hammer to terminate the experiment, just as the astonished police
arrived.[5] The Discovery Channel's popular MythBusters show examined Tesla's claim that he had created an "Earthquake Machine" in their 60th
episode. They tested the physical phenomenon known as mechanical resonance on a traffic bridge, which today are built to withstand such forces. While
a single I-beam of steel was deflected several feet in each direction by their oscillator, and they reportedly felt the bridge shaking many yards
away, there were no "earth shattering" effects. It is worth indicating that, in the time of the event undertaken by Tesla, buildings were not built
to withstand such resonance.
See Also-
String Resonance
Electrical Resonance
Vibration
Determine speed (freq) of rotor with wobble (method)
Laser Applications (resonance)
Resonance
Resonator
The Rayleigh-Ritz method of determining natural resonant freq of materials &
structures
Energy Vibration & Resonant Freq: when Science & Health Mix
The Keys, Locks & Doors of the G.Pyramid
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How does the 'medium' affect a waves frequency?
This final link will help myself, Masta G & the like understand resonance & sound waves better & how it all relates, the earlier questions asked by
MastaG & myself regarding Cymatics & the resonant freq of the steel plates or the rice etc,
Answer (in brief) "Summing up, the medium does not affect a waves frequency. The source is the only thing that determines it."
So then we may discover interesting affect by matching the resonant frequency of the medium with the source,
(say a limestone block, & at resonance maybe it explodes??)
however the resonant freq of the medium won't change the frequency of the wave & therefore is inconsequential in determining the cymatic frequencies.
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P.L.U.R.I
-B.M
[edit on 14/9/09 by B.Morrison]
[edit on 14/9/09 by B.Morrison]
I can be forgetful sometimes, as you are finding out, sorry for the re-posted information, I'll be using the other numbers
from that chart for mixing my songs now, its going to come in real handy. 
) THEN RIGHT
CLICK ON THE IMAGE YOU WANT TO SEE FULLSIZE & FROM THE MENU SELECT 'VIEW IMAGE' TO SEE THE IMAGE BY ITSELF IN A NEW PAGE, USE THE CURSOR/MAGNIFYING
GLASS (IF USING FIREFOX) TO SEE @ FULL RESOLUTION FOR READING 
