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Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

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Another variation is to close off one end of the tube and blow across the other end.  The frequency heard when striking the pipe against your hand should also be the same frequency heard when blowing across the pipe. 

The Boomwhackers are just a larger version of the palm pipes.  These are meant to be struck on the side with the mallet or the edge of a table.  These also come with a set of caps so that you can show that the fundamental changes by one octave depending on whether the pipe is open or closed.