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The euphonium's ancestor was the serpent. It was given this name because of its snakelike shape. The serpent was invented by Edme Guilliame of Auxere.
http://www.dwerden.com/forum/content.php/124-an-historical-lineage-of-the-modern-baritone-horn-and-euphonium#.VhRNeIgVT7Y -
The ophicliede is another ancestor of the euphonium. It was invented by Jean Hilaire Aste. It was similar to the saxophone, but was played with a mouthpiece.
https://prezi.com/aip20zyejeo3/the-euphonium/ -
Sommers of Weimar usualy gets the credit for inventing the first euphonium in 1843. It was designed to replace tenor tubas. It was a in the shape of a wide, valved bugle.
http://www3.nd.edu/~baritone/history.html -
Alfred James Phasey made the width of the euphonium's bore larger. He did this once in 1859. He did it again in the 1870s, probably to improve it.
http://www3.nd.edu/~baritone/history.html -
Dr. David Blakely created a new valve system for the euphonium. This helped it to have a better tone quality. It worked so well that the companies that manufactured instruments used it as soon as the patent ended.
http://www.davechilds.com/reviews-and-articles/article=the-history -
Around the 1880's, the Conn company invented the double-bell euphonium. It was meant to combine the sounds of the euphonium and trombone. It did not last.
http://www3.nd.edu/~baritone/history.html -
Stephen Mead improved the euphonium by adding a tuning slide. He worked with Boosey and Hawkes. This euphonium is the most common today.
http://www.davechilds.com/reviews-and-articles/article=the-history
