How long should I cut my pipes?

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From: thomasr
Date: Wed, 20 Aug 1997 00:00

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Could someone tell me how long to cut a one-inch pipe to get middle C?

I am trying to make a set of pipes to use as primitive brass instruments
for a chidren's music class.  I understand that I should operate on the
following formula:

       x is do
7/8 of x is re
4/5 of x is mi
2/3 of x is so
3/5 of x is la

But I don't know any formula for setting do.
Could anyone give me such a formula, or tell me where to find a chart?

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From: thomasr <thomasr@utkux.utcc.utk.edu>
Subject: How long should I cut my pipes?
Date: 1997/08/20
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