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Dirty-South Blues Harp forum: wail on! >
Airblocking, throatblocking, thought experiment
Airblocking, throatblocking, thought experiment
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wolfkristiansen
374 posts
Aug 30, 2015
1:56 AM
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When you blow into the air to create a stream that reaches a harp a couple inches away, you will not significantly affect the ambient air pressure no matter how hard you blow. This allows you to create the pressure differences that are related to the stream. When your mouth is sealed against the harp, the pressure in your mouth can not have the large variations required to create a stream. When you raise the pressure, you up the pressure in your entire mouth.
I was talking with James Cotton just the other day about this very phenomenon. He agreed with me.
Cheers,
wolf kristiansen
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MindTheGap
655 posts
Aug 30, 2015
3:27 AM
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Nate - surely the thing to rule in/out first is to get the Filisko trainer, or make one, and see if it looks like your embouchure is covering the holes either side or not.
Having read Philosofy's post about being able to feel the side holes open, I have to agree. It does feel like that. But how can that be?
The fact that I can make airstreams in the mouth is beyond doubt. I have a sensitive tooth on one side and, can direct cold, inhaled air over that if I want. Not a very useful thing to do though. When I TB either side, I can feel the cool air going up one side of the mouth or the other. But it doesn't mean it's an explanation for your thing.
Last Edited by MindTheGap on Aug 30, 2015 3:30 AM
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nacoran
8649 posts
Sep 01, 2015
11:28 AM
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Mind the Gap, I think you're right. I'll have to get some gear to be able to prove/disprove it. I'm convinced based on my own senses what is happening, but that's not the same thing as being able to offer evidence.
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Nate
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First Post- May 8, 2009
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timeistight
1855 posts
Sep 01, 2015
1:18 PM
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Put the whole low end of a harmonica inside you left cheek. If you play single notes like that -- without tongue blocking -- that would be evidence.
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nacoran
8650 posts
Sep 01, 2015
3:04 PM
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If I put the whole end of the harp in my mouth it distorts my whole mouth shape (at least if I go past the corner). All I can say is that I can play a single note, stop breathing, and without moving my lips I can move my tongue up and find 3-4 holes with my tongue not covered by my lips. I can also stop breathing and pull the harp away from my lips and take a look at my tongue. It's definitely sort of funnel shaped, but not the front end like when you roll your tongue. I seem to naturally do this on just about all blow notes, and a little less regularly on draw notes.
Mind the gaps comment gave me another idea on how to demonstrate that you can in fact have separate air streams inside your mouth- make a shape with your lips where you have a hole on either side of your mouth but your lips are touching in the middle. Now play around with your tongue in the back of your mouth (no tongue blocking). See if you can get the air to come mostly out of one side of your mouth while keeping your lips that shape. I can (it's more awkward than when I do it on the harp, but on the harp I'm sending it down the middle, not the sides).
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Nate
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