 The Clarinet BBoard
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Author: Tim Wilson
Date: 2000-06-09 02:40
I'm interested in finding out more about the bore on my R-13 and how it compares to a wide-bore Leblanc that I'm interested in. The Leblanc has a bore of 15 mm. Does anyone know what the term "poly-cylindrical" really means and how it might compare to the wide-bore Leblanc? Thanks!!
-Tim
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Author: Mark Charette
Date: 2000-06-09 03:17
Tim Wilson wrote:
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Does anyone know what the term "poly-cylindrical" really means
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The upper joint on a polycylindrical clarinet consists of two or more cylindrical sections, with a short taper linking the cylinders. if you take an inside mic or telescoping gage and measure the upper joint you'd be be able to plot how long and large the cylindrical sections are. It helps correct some inherent problems in clarinet intonation.
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Author: Eoin
Date: 2000-06-09 07:26
While the bore in a clarinet is roughly cylindrical, it does get slightly narrower at the top one third of the upper joint, and obviously expands greatly into the bell. The bore measurement is at the narrowest point. Up to about 1950, the reduction in bore to the narrowest point was by gradual tapering the bore, in the form of a truncated cone. Someone, I think Buffet, discovered that the sound could be improved by reducing the bore in a series of step changes, so that each section remained cylindrical. This technique is known as polycylindrical bore. I think that the R13 was the first to use this technique. (Some early R13's do not have polyclindrical bore). It is used in all modern professional clarinets and seems to be one of the major advances in clarinet design in the 20th century.
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Author: herb
Date: 2000-06-09 14:19
See the comprehensive posting by Ed Riley, moderator of the Selmer BBS at:
http://slmrweb.selmer.com/clarinet/discus/
>>>Clarinet Discussion
>>>>>What do players look for in an artist clarinet
>>>>>>>By Ed Riley on Sunday, 4/23/00 09:15 am:
Explains Poly-cylindrical vs reverse-taper; barrel and bell chokes; bore sizes, etc. Compares different makes/models. A "keeper" for your reference shelf.
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Author: Don Berger
Date: 2000-06-09 14:58
A very good "run-down" above re: bores. We have discussed this subject several times before, search the PHorum for those. I'll need to look up Riley's comments also. In "Clarinet Acoustics" by O Lee Gibson he discusses and gives measured examples of some of the more recent cl's, and [like others] gives credit to Robert Carree of Buffet on the creation-commercialization of "polycylindrical" bore configurations. Both Brymer and Rendall [prob. others] discuss bores in their earlier books. Benade's books, like his "Horns Strings and Harmony" also discuss acoustics, a bit more complicated. I believe I posted the number of Carree's patent in an earlier BBoard thread, will look it up and add it here if desireable. Still an interesting subject. Don
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Author: Don Berger
Date: 2000-06-09 20:13
I looked for Carree's patent on the "P C bore", didnt' find a US but did turn up a French pat. no. 1,137,138 of 1957 which may be it, can you help me, Mark C?? It is referenced in Werschnik, Munich, DE, US 4,245,543 [1981], the "background/summary" [7 pages] of which gives in GREAT detail his solutions to these tuning problems. Happy reading. Complicated!! Don
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Author: paul
Date: 2000-06-12 20:03
Mark C: A while ago, I did an analogy with visualizing some tin cans of various sizes strung together to help folks get the point. Perhaps you can help the original poster find this old set of messages somewhere on your rusty hard drive...
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Author: Mark Charette, Webmaster
Date: 2000-06-12 20:24
paul wrote:
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Mark C: A while ago, I did an analogy with visualizing some tin cans of various sizes strung together to help folks get the point. Perhaps you can help the original poster find this old set of messages somewhere on your rusty hard drive...
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Perhaps searching for "paul and polycylindrical" would bring it up ":^)
(soup cans, not tin cans, which is why you may not have found it on first try)
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