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Post horn

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Through Ludwig van Beethoven, World War I and Unicode

Use and construction

The post horn is sometimes confused with the coach horn, and even though the two types of horn served the same principal purpose, they differ in their physical appearance. The post horn has a cylindrical bore and was generally used on a coach pulled by two horses (technically referred to as "Tonga"); hence, it is sometimes also called the Tonga horn. The coach horn, on the other hand, has a conical bore and was used on a coach pulled by four horses (referred to as a "four-in-hand"). The post horn is no more than 32 inches (810 mm) in length, whereas the coach horn can be up to 36 inches (910 mm) long. The latter has more of a funnel-shaped bell, while the former's bell is trumpet-shaped. Post horns need not be straight but can be coiled—they have a smaller bore—and they are made entirely of brass. A post horn will have a slide for tuning if intended for orchestral settings.

The instrument is an example of a buisine, a precursor to the "natural" trumpet. The cornet was developed from the cone-shaped coach horn through the addition of valves, while the cylinder-shaped trumpets remained predominantly valveless for several decades.

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