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RE: Polycylindrical Bore

Author: Todd twholle
Date: 2000-02-04 22:22

This is an interesting and apparantly very complex topic. Which end of this polycylindrical bore is the larger one, the upper or the lower? I obviously have no real idea about the construction differences of different kinds of clarinets, even though I have been swabbing three different ones out for a few years. I guess they are basically purely cylindrical bore instruments because I found only about .005" difference in bore diameter when I measured one. I took a look at a couple of Recorders( yes, the deadly "Blockflutes") that I have, and see that they have an appearantly conical bore where the fipple is at the larger end. These instruments overblow an octave, ( as does the flute;which by the way also has a conical bore)and have a very characteristic tone. I wonder if this "reversed bore" situation also applies to the polycylindrical bore of some clarinet upper joints. It seems like if so, that it would do something to change the tone as well as possibly adding a little blowing resistance to the clarinet.

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