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The trombone, perhaps the earliest of the instruments i contemporary orchestral use to develop and retain a fundamental regularity of form, is based in principle upon the utilization of a telescopic slide in the production of chromatic tones.

The characteristics of the construction of a trombone are basically, and broadly, the same as for the modern trumpet: A mainly cylindrical body-tube, narrow in relations to its length; a bell section expanding in a gentle curve to a wide terminal flare; and a deep mouthpiece with a well-developed throat. The essential difference between the two instruments lies in a different arrangement of relative proportions in these three elements. The cylindrical diameter in the majority of trombones is usually, length for length greater than in the trumpet. The bell of the trombone takes up about one-third of the total, closed slide length of the instrument as opposed to one-forth in the classic trumpet. Finally, the trombone is possessed ordinarily of its most obvious characteristic, the telescopic slide, except in the case of the valve trombone.



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