One is to change the length of the tube, and thus the length of the vibrating air column.

NPR: Young Tuba Player Gets Nod from Phila. Orchestra

The vibrations of the lips, focused and amplified by the mouthpiece and directed into the tube, cause the column of air inside the tube to vibrate, and as in all wind instruments, the vibrating air column produces the sound of the instrument.

NPR: Young Tuba Player Gets Nod from Phila. Orchestra

This is the so-called jet stream, the fast river of air that helps drive our weather, which interacts with the storm's updrafts to create a spinning column of air.

CNN: The making of a nightmare tornado

It consists of condensed water droplets and is associated with a column of air that rotates as it is drawn into the cloud.

BBC: Funnel clouds, twisters, tornados: What are they?

Column inches and air time are poor measures of influence.

ECONOMIST: Here is the news

Yet it is nothing short of terrifying to recognise that Clay, on his own authority, gave very serious consideration to using an armoured column backed up by support from the air to break the blockade.

ECONOMIST: The cold war

In a column on Tuesday in the country's the Nation newspaper, former Pakistan Air Force group captain S.M.

WSJ: Pakistan's Newly Elected Leader Seeks Better India Ties

The volcano, in the North Island, sent a column of ash at least 2km (1.25 miles) into the air, scientists said.

BBC: New Zealand's Mount Tongariro erupts

In a column in Wired today, Wiens compares the new Macbook Pro to the Macbook Air, which sacrificed upgradeability and reparability in pursuit of thinness and sold millions as a result.

FORBES: Why The New Macbook Pro's Repair Problems Matter