[pianotech] Totally glueless

[Tony Caught]

Now now children. Tony
On Feb 1, 2013 11:17 AM, "Ron Nossaman" <rnossaman at cox.net> wrote:

> On 1/31/2013 6:06 PM, Euphonious Thumpe wrote:
>
>> Please allow me to point out, Kind Sirs, that the function of simple
>> tuning fork exhibits those traits of energetic
>> transmission/transmutation that some members of this list seem to
>> discount as fantasy: specifically, that when the ball at the end of a
>> tuning fork stem is simply, gently pressed (with no solid mechanical
>> coupling) against some object (and with the briefest of all possible
>> contact points) energy is transmitted from the laterally oscillating
>> tines well ABOVE that point TO that object; which then transmits them to
>> the the surrounding air, resulting in sound of a louder volume than the
>> tines alone impinging on the air create. And that this phenomenon will
>> transpire even if the object thus pressed against is a distinctly
>> non-diaphragmatic -- as we normally conceive it -- one, such as a cube.
>> I thus find it implausible that such an easily observed phenomenon would
>> not find expression in a structure as large, solid, and rife with
>> vibratory excitement as that which a piano presents.
>>
>
> The tines of a sounding tuning fork move in opposite directions from one
> another, the tips describing a curve. It's not an arc, and I don't know
> what the curve is called, but it is a curve. When the tines are parallel,
> the fork is at it's longest overall length. When the tines are either
> closest together, or farthest apart, the fork is at it's shortest overall
> length. The difference isn't much, but there is a difference. This cyclic
> difference in length causes the handle tip to cycle up and down
> perpendicular to the tine movement. Press the handle against something
> solid and it cyclically pushes against the object, moving it slightly,
> displacing air, and producing a tone that is twice the frequency of the
> fork since there are two length change cycles for each tine cycle.
>
> That's it.
>
> Ron N
>
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