Re: [Harp-L] magnets



Magnets placed near the reeds, if they have any effect at all, would tend to dampen the vibration of the reed. The reed is a conductor. The magnetic field induces electrical currents in a moving conductor...the reed. There is no large loop but there could be small loops within the reed in which case the currents are called "parasitics". The effect may be very small if the field is weak. The currents would convert mechanical vibrational energy into heat.

The main effect would be that you would have to blow a bit harder to get the same amplitide of reed vibration. Magnets and shorted coils are placed in micro balances to dampen their oscillations.

Magnets, because of their unseen fields, are favorites for scamming the non-technical consumer, especially the ones sold to be worn near the body to allegedly alleviate pain. If the body responded to magnetic fields, an MRI scan would be instantly fatal because the field strengths used are orders of magnitude greater than those from little permanent magnets. If one has an implanted pacemaker, then he must avoid strong magnetic fields because that is how information is transmitted to change the pacemaker modes and settings.

Vern
Visit my harmonica website www.Hands-Free-Chromatic.7p.com

----- Original Message ----- From: "Leonardo Kenji Shikida" <shikida@xxxxxxxxx>
To: "Harp-L" <harp-l@xxxxxxxxxx>
Sent: Thursday, May 03, 2007 9:51 AM
Subject: [Harp-L] magnets



from:

http://www.harponline.de/index.php?page=specials/hering/specials106_goldblow_01&lang_id=en_GB

Hering released new diatonic harps, customized for overs.

Among several interesting characteristics, they're using magnets near the reeds.

I am curious about what is the effect of such mechanism. How magnets
change the harp sound? Do they influence over harmonics? Ou maybe do
they make overs easier?

What are your thoughts?

TIA

Kenji
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