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Science > Physics |
| User: |
"Nicci" |
| Date: |
27 Apr 2007 05:25:01 PM |
| Object: |
Acoustics Puzzle |
I found this print from an 1880's encyclopeadia showing the
acoustics of a tuning fork. When I looked at it (knowing next
to nothing about music scale or physics) the musical scale
seems to be based on magnetism, or something like it.
http://eaulber.googlegroups.com/web/Acoustics_fullpage.JPG
Can somebody please help me out here and describe the
scientific figures?
Thanks :)
n.
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| User: "" |
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| Title: Re: Acoustics Puzzle |
27 Apr 2007 05:55:02 PM |
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In sci.physics Nicci <n.m.keele@hotmail.co.uk> wrote:
I found this print from an 1880's encyclopeadia showing the
acoustics of a tuning fork. When I looked at it (knowing next
to nothing about music scale or physics) the musical scale
seems to be based on magnetism, or something like it.
http://eaulber.googlegroups.com/web/Acoustics_fullpage.JPG
Can somebody please help me out here and describe the
scientific figures?
Thanks :)
Nothing to do with magnetism.
They are attempting to show how the vibrating tuning fork generates
sound waves.
Try this slightly more modern explaination:
http://www.physicsclassroom.com/mmedia/waves/tfl.html
--
Jim Pennino
Remove .spam.sux to reply.
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| User: "fields" |
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| Title: Re: Acoustics Puzzle |
28 Apr 2007 11:29:03 AM |
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Nicci wrote:
I found this print from an 1880's encyclopeadia showing the
acoustics of a tuning fork. When I looked at it (knowing next
to nothing about music scale or physics) the musical scale
seems to be based on magnetism, or something like it.
http://eaulber.googlegroups.com/web/Acoustics_fullpage.JPG
Can somebody please help me out here and describe the
scientific figures?
Thanks :)
n.
It shows the motion of tines in time. They can vibrate in several
different directions, each of which has a different resonant frequency.
Among the prominent motions is an elliptical motion which they show
in a loop around the tines.
--
Matthew H. Fields http://www.matthewfields.net
Music: Splendor in Sound
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| User: "Randy Poe" |
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| Title: Re: Acoustics Puzzle |
27 Apr 2007 06:00:35 PM |
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On Apr 27, 6:25 pm, Nicci <n.m.ke...@hotmail.co.uk> wrote:
I found this print from an 1880's encyclopeadia showing the
acoustics of a tuning fork. When I looked at it (knowing next
to nothing about music scale or physics) the musical scale
seems to be based on magnetism, or something like it.
http://eaulber.googlegroups.com/web/Acoustics_fullpage.JPG
Can somebody please help me out here and describe the
scientific figures?
Thanks :)
n.
You don't have the article that went with it?
I don't think this has anything to do with magnetism. I think
it is attempting to show the nature of the pressure waves
created by vibration of the fork, but it's hard to make sense
of most of the figures without some text.
I could imagine Figure 5 as a top view of the tines of the
fork. They vibrate toward and away from each other,
as the figure shows. The slanted lines around the fork
may have something to do with the pressure amplitude
or phase at different points. It seems to indicate
maxima at four equally spaced directions around the
tuning fork.
That would seem to agree with the opening sentence of
this abstract:
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=AJPIAS000068000012001139000001&idtype=cvips&gifs=yes
- Randy
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| User: "Nicci" |
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| Title: Re: Acoustics Puzzle |
28 Apr 2007 05:34:40 PM |
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Thanks everso much for your help :)
they reminded me of the patterns made by
iron filings around magnets, but when I saw
the scale I couldn't make sense of it.
It got me into thinking about phonons and
photons, and as I'm trying to put 'gravity'
into perspective at the moment, the drawing
caught my attention.
I'll read through the links, I've a feeling
they'll put some earlier bits of reading in
some kind of order, and hey! it'll be good to
listen to something nice while I do!
I have another on chaldni plates which is
very dull, and theres no text to any of the
plates. (My parents were antiques dealers
and the encylopeadia was split and all the
pretty ones were sold leaving a few out-of
-date technology plates normally dropped
in the nearest wastepaper basket! -lucky
for me!)
thanks,
n.
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