Hornbostel - Sachs
Valve horns with narrow bore
The air itself is the vibrator in the primary sense. The standing waves are significantly confined within the instrument itself. The air-stream passes through the player's vibrating lips, so gaining intermittent access to the short air column which is to be made to vibrate. The tubular body has a narrow bore profile that is intermediate between conical and cylindrical. The body can be lengthened or shortened by connecting or disconnecting auxiliary lengths of tube. Cornet, F alto horn, B flat altissimo horn.
Valve horns with narrow bore, with short air column (less than 2 m)
Valve horns with narrow bore, with short air column (less than 2 m) and with crooks