Instruments having a cylindrical, or mostly cylindrical, bore include:
Instruments having a conical, or approximately conical, bore include:
Bores of real-world woodwind instruments overall may approximate a cone or a cylinder. However, portions of the bores may deviate from these idealized shapes. For example, though oboes and oboes d'amore are similarly pitched, they have differently shaped terminal bells. Accordingly, the voice of the oboe is described as "piercing" as compared to the more "full" voice of the oboe d'amore.
Although the bore shape of woodwind instruments generally determines their timbre, the instruments' exterior geometry typically has little effect on their voice. In addition, the exterior shape of woodwind instruments may not overtly match the shape of their bores. For example, while oboes and clarinets may outwardly appear similar, oboes have a conical bore while clarinets have a cylindrical bore.
Brass instruments also are sometimes categorized as conical or cylindrical, though most in fact have cylindrical sections between a conical section (the mouthpiece taper) and a non-conical, non-cylindrical flaring section (the bell). Benade gives the following typical proportions:
To complicate matters these proportions vary as valves or slides are operated; the above numbers are for instruments with the valves open or the slide fully in. Therefore the normal mode frequencies of brass instruments do not correspond to integer multiples of the first mode. However, players of brasses (in contrast to woodwinds) are able to "lip" notes up or down substantially, and to make use of certain privileged frequencies in addition to those of the normal modes, to obtain in-tune notes.
WIPO ASSIGNS PATENT TO AIRBUS OPERATIONS FOR "TAPPED INSERT FOR CYLINDRICAL BORE AND INSTALLATION EQUIPMENT FOR SUCH INSERT" (FRENCH INVENTORS)
Jan 15, 2011; GENEVA, Jan. 15 -- Publication No. WO/2011/003571 was published on Jan. 13. Title of the invention: "TAPPED INSERT FOR...
US Patent Issued to Gehring Technologies on Oct. 23 for "Machine for Creating Non-Cylindrical Bore Surfaces" (German Inventors)
Oct 29, 2012; ALEXANDRIA, Va., Oct. 29 -- United States Patent no. 8,292,695, issued on Oct. 23, was assigned to Gehring Technologies GmbH...
Wipo Publishes Patent of Audi and Jakob Lach for "Method and Tool for Producing an Exact-Fit Cylindrical Bore by Removal of Material from an Existing Bore with a Finishing Allowance" (German Inventors)
Sep 20, 2013; GENEVA, Sept. 20 -- Publication No. WO/2013/135392 was published on Sept. 19.Title of the invention: "METHOD AND TOOL FOR...
Patent Issued for Cooling MRI Components/ Electronic Circuit Elements/ Bed through Gas Flow Paths Formed between Cylindrical RF Coil Unit Base and Cylindrical Bore Tube
Feb 13, 2013; From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Katsunuma, Ayumi (Otawara, JP);...