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Author Topic: Peter Davey Heater  (Read 489304 times)

Paul-R

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Re: Peter Davey Heater
« Reply #330 on: June 25, 2008, 04:23:15 PM »
According to the text we have tuning is for the inner bell only and then the distance from the outer bell.
I am certain that BOTH the inner bell and the outer bell must be tuned to resonate with
the frequency of your mains.
Paul.

devrimogun

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Re: Peter Davey Heater
« Reply #331 on: June 26, 2008, 03:40:15 PM »
I am certain that BOTH the inner bell and the outer bell must be tuned to resonate with
the frequency of your mains.
Paul.

Could you explain the dynamics if it is more then a feeling please.

Paul-R

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Re: Peter Davey Heater
« Reply #332 on: June 26, 2008, 03:57:35 PM »
Could you explain the dynamics if it is more then a feeling please.
Its what Mr Davey says.
Paul.

devrimogun

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Re: Peter Davey Heater
« Reply #333 on: June 26, 2008, 03:59:42 PM »
Its what Mr Davey says.
Paul.

Is there an indication on the frequencies?

Paul-R

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Re: Peter Davey Heater
« Reply #334 on: June 26, 2008, 04:08:19 PM »
Is there an indication on the frequencies?
The frequency is simply the frequency of the experimentators AC mains supply
(or an octave of it).
Paul.

devrimogun

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Re: Peter Davey Heater
« Reply #335 on: June 26, 2008, 04:13:25 PM »
The frequency is simply the frequency of the experimentators AC mains supply
(or an octave of it).
Paul.

Yes there is no doubt about it.
I meant to ask if both are the same frequency?

Paul-R

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Re: Peter Davey Heater
« Reply #336 on: June 26, 2008, 06:38:04 PM »
Yes there is no doubt about it.
I meant to ask if both are the same frequency?
Yes. both bells are tuned to the fr4quency of your AC mains, or
an octave.

forest

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Re: Peter Davey Heater
« Reply #337 on: June 26, 2008, 07:00:40 PM »
How to tune them ? I can't imagine tuning while connected to mains... Do you really think that AC current produce a sound while passing through conductor ? Then why I don't hear any sound  in my wall socket ?

edelind

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Re: Peter Davey Heater
« Reply #338 on: June 26, 2008, 08:05:27 PM »
How to tune them ? I can't imagine tuning while connected to mains... Do you really think that AC current produce a sound while passing through conductor ? Then why I don't hear any sound  in my wall socket ?
The easiest way to do it (for the rest of us, non-musicians) is to use computer software to analyze the sound the bell emits. From my experience it is the same as the frequency it resonates.

As a software, you can use Audacity or Spectrogram. After you see the frequency (frequencies)  your bell is emitting when hit, you can machine it gradually until you reach the desired harmonic of the mains.

You can check your resonance by using a sound frequency software generator, like PAS Frequency Generator, and put the sound into some large speakers (my portable stereo was enough in my case). Then place the bell as near as possible to the speakers and tune the software emitted frequency around your bell's frequency. If you cannot feel the vibration in your hand at resonance (as you definitely won't be able to hear it), you can place a small plied piece of paper on the bell's edge (keep the bell with the edges on top). You will see the paper starting to "dance" or even jumping out of the edge when you reach resonance. The only problem with this software generator is that you can only adjust with integer hertz values, which is a real problem for reaching a perfect resonance. But it will still work.

Please note that a lose bell will have a slight different frequency that the same one hard connected to a rod.

forest

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Re: Peter Davey Heater
« Reply #339 on: June 26, 2008, 08:27:02 PM »
Thank you. That was very useful information about how to tune bells to resonance with MECHANICALLY caused resonance. The point is that I don't believe AC current simply put through bells will force them to vibrate! There is some trick here, maybe related to loosely mounted bells.Maybe those bells are in such position then they create a circuit shortcut for a very small period and the arc produced is acting on them mechanically... As I mentioned I found a patent which describe similar device in shape, but vibrations there are produced by pulses from HV capacitor discharge

DOCV

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Re: Peter Davey Heater
« Reply #340 on: June 26, 2008, 09:27:18 PM »
whats the patent number ?

NerzhDishual

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Re: Peter Davey Heater
« Reply #341 on: June 26, 2008, 09:43:32 PM »


Hi Guys,

@Storre:
The Bass, the Dijeridoo, the Djembe and the Scottish Snare
should be mandatory in any 'worthy 'music piece. :) ;D

@Devrim:
Further to your kind demand, I have finally recorded my bells/cups... :P ;)

@Forest:
Quote
Egg shaped device for making tea
. Good idea, IMHO.

My new page about the freqs is:
http://freenrg.info/Sonettes_Davey/Freq/

Needs more explanations.
For ex: my first measures tend to show that the freq. of one cup/bell
does not vary (very much) should this cup be 'alone' or coupled with another cup...

Best

forest

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Re: Peter Davey Heater
« Reply #342 on: June 26, 2008, 10:42:31 PM »
whats the patent number ?

patent no 3230506 E.J. Hellund "Pressure pulsation generator"

Paul-R

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Re: Peter Davey Heater
« Reply #343 on: June 26, 2008, 11:30:52 PM »
How to tune them ? I can't imagine tuning while connected to mains... Do you really think that AC current produce a sound while passing through conductor ? Then why I don't hear any sound  in my wall socket ?
The resonant effect is electrical, not sound.

A way to tune is to connect a very heavy resistor in series with a small cheap loudspeaker, and connect them across the mains.

You will hear a heavy bass hum.

Using hemisherical bells (like soup ladles), drill a hole in the middle of the sphere of the bell. Using a small threaded shaft and some nuts, fix this bell to the chuck of a power drill so that it can turn like a drill bit. Using a striker or a bow, sound the instrument. Listen for the tone.

Compare this tone to the tone coming from the mains/loudspeaker.
Start up the power drill. Using a file or another grinder, grind the rim of the bell down, and as you do this, its tone will get higher. At some point, it will start to approach the tone from the loudspeaker, except that it will be several octaves higher.

You will start to hear a fluttering sound when the frequency of the bell approaches that of the bell. Grind a bit more off. The fluttering will slow until it becomes a wow-wow-wow type of sound. Grind a bit more off until this wow-wow sound becomes continuous. It is in tune.

If you can get to a piano, possibly in a piano shop, ask the sales assistant to show you a G sharp just above the E of the double bass. This is, very approximately, the basic 50 cycles mains hum. Ask him or her to play G sharp three octaves higher. This is probably the sound that you will be after (if your bell is about the size of a bicycle bell). This exercise is a good rehearsal for the real thing.

If you are in the States where AC power is 60 cycles per second, ask  for E above the G sharp. The note is in between E and F.
Paul.

NerzhDishual

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Re: Peter Davey Heater
« Reply #344 on: June 27, 2008, 01:13:59 AM »

Hi Guys,

Should anybody be interested in, this page:
http://freenrg.info/Sonettes_Davey/Freq/  has just been updated. :P

I'm now searching for a good mussel hunting workshop.... ;D

Best