Leadpipe
Encyclopedia
Basic trombone anatomy
  1. tuning slide
  2. counterweight
  3. mouthpiece
  4. slide lock ring
  5. bell
  6. knob/bumper
  7. water key/spit valve
  8. main slide
  9. second slide brace/stay
  10. first slide brace/stay
  11. bell lock nut

In a brass instrument
Brass instrument
A brass instrument is a musical instrument whose sound is produced by sympathetic vibration of air in a tubular resonator in sympathy with the vibration of the player's lips...

, a leadpipe is the pipe
Pipe
Pipe may refer to:* Pipe , a hollow cylinder following certain dimension rules* Smoking pipe* Pipe or butt, a cask measurement* Pipe , a type of metal casting defect...

 or tube
Cylinder (geometry)
A cylinder is one of the most basic curvilinear geometric shapes, the surface formed by the points at a fixed distance from a given line segment, the axis of the cylinder. The solid enclosed by this surface and by two planes perpendicular to the axis is also called a cylinder...

 into which the mouthpiece
Mouthpiece (brass)
On brass instruments the mouthpiece is the part of the instrument which is placed upon the player's lips. The purpose of the mouthpiece is a resonator, which passes vibration from the lips to the column of air contained within the instrument, giving rise to the standing wave pattern of vibration in...

 is placed.

For example, on the illustration of a trombone
Trombone
The trombone is a musical instrument in the brass family. Like all brass instruments, sound is produced when the player’s vibrating lips cause the air column inside the instrument to vibrate...

, the leadpipe would be between #3 and #4, the mouthpiece and the slide lock ring. In the illustration of a French horn, the leadpipe is #2.

Some instruments have a swappable leadpipe to allow changing key.
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