Flute, oboe and bassoon belong to the tools that provide all the natural sounds - both even and odd. Used are, of course, octave relative to the fundamental tone (i.e. the 2nd and 4th), which are taken at the special position of the flute lip, as noted above, the oboe and bassoon - with octave valves.
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Fingering for the octave overtone is used in general the same as for the fundamental tone (with some complication of the bassoon), but the whole scale will sound an octave higher.
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In view of the cylindrical section of pipe is installed in the clarinet oscillatory motion of the air column, such a closed pipe, that is, with negative pressure (node) from one end of the tube and condensation (antinode) at the other, whereas in the flute, oboe and bassoon in the vibration of the air column concentration ( antinode) is formed at both ends of the tube, and vacuum (node) in the middle.
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Therefore, sounding air column in the clarinet by reflection, as it were complicated by half compared with the flute, oboe and bassoon, which means it is twice as long as tube instrument, while the flute, oboe and bassoon sounding air column is the length of the tool.