Peter Davey Heater

[DOCV]

whats the patent number ?

[NerzhDishual]

Hi Guys,

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

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

@Forest:

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]

whats the patent number ?

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

[Paul-R]

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]

Hi Guys,

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

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

Best