The trombone is certainly the most recognizable wind instrument, being the only one with a true slide section. The trombone has been in existence for centuries under various forms and names, but has remained relatively unchanged for a majority of that time.
In the 15th century, when trombones developed from the Renaissance slide trumpet, they were called trombone in Italian and Posaune in German, just as they are today. In English, however, they were known as sackbuts.
The slide trumpet was unique because its mouthpiece could telescope into the adjacent lead pipe, thereby shortening the instrument and changing the pitch. The sackbut kept the sliding idea, but separated the sliding area from the bell; that way the bell always remained the same distance from the mouth of the player.
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