Craft · 6 pages · 12 min

How valves and slides change a tube's length

A valve sends the air through an extra loop of tubing, and a slide extends the tube, so the air column gets longer.

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From the opening

A brass instrument sounds a length of tube, and valves and slides change that length. A valve redirects the air through an additional crook, and a slide, as on a trombone, moves a U-shaped section out so the whole column is physically longer. The opening covers a valve inserts an extra loop, a slide lengthens both legs, and a longer tube lowers the series.

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Inside

A valve inserts an extra loop
A slide lengthens both legs
A longer tube lowers the series
They are not woodwind tone holes
Where the idea stops applying
A distinction worth keeping

Sources

Brass valve crooks
Trombone slide air column

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How valves and slides change a tube's length

From the opening

Inside

Sources

Also on the desk