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low/ high sounds on a pipe

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mollykins | 15:12 Mon 17th May 2010 | Science
6 Answers
this is probably to do with the physics of the sound waves so i thought it was best to put it in science.

At cadets, we use a boatswians call to pipe ceremonial occaisions or announcements ie, the ensign has been raised or lowered, or its time for a break.

this is a picture of one. http://ahoy.tk-jk.net...es/BoatswainsCall.jpg

Because there is no ball or anything inside the bouy, you have to cover your hand over the hole, to make a high sound and don't cover it, for a low sound. However when i do it, its the reverse, it doesn't matter which pipe i use, its the same. but why and how?
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I would guess that you either lower your hand too far and restrict the air flow, or don't bend your fingers the right way for the light call.
Question Author
For the call, that should be low, you don't cover the hole at all.

But i can get the sharpness right, its sjut the completly wrong pitch.
You'll get it eventually, just keep practicing.
Question Author
I can get the sharpness but the pitch is wrong and you can't do anything about the pitch, other than raising and lowering your hand, but when i do that, the pipe does the opposite to what it should do!!!!!
I was mildly interested in this, did a bit of googling, and came up with this link;

http://www.sccheadqua...20Call%20Handbook.pdf

There appears to be some useful pictures and guide instructions from around page 7 onwards. Have you already seen it Molly?
Question Author
If you go to page 12, it says how the raised hand makes a low sound and vice versa, but no mtter which pipe i use, i can't do it that way and noone can do it the way i do.

One of the calls, the carry on should go from low to high, but i have to do the hand movements the other way round, to create the right sound.

So can't anyone explain the physics behind what is happening?

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