Probably to keep the main tuning slide away from your front side (shirt, gut, etc.) when holding it. Especially if the slide is pulled out some and has grease on the leg. There are a bunch of different type things on euphoniums that do just that, but each one looks a little different. You find these mainly on euphoniums which have a trigger to activate the main tuning slide to flatten notes that may be sharp.
Here is a picture of my horn after a few mods were done last year:
You can see what I have to cover the main tuning slide leg. It looks a little different from yours, I have a screw to loosen the covering device and move it up and down. Looks like you have some push pins to change it a certain amount. I guess this must be a "new" feature with Adams horns. Can anyone else verify that comment.
Roger - did you specifically ask for this feature?
John Morgan
The U.S. Army Band (Pershing's Own) 1971-1976
Adams E3 Custom Series Euphonium, 1956 B&H Imperial Euphonium,
1973 F. E. Olds & Son Studio Model T-31 BaritoneAdams TB1 Tenor Trombone, Yamaha YBL-822G Bass Trombone
Year Round Except Summer:
Kingdom of the Sun (KOS) Concert Band, Ocala, FL (Euphonium)Summer Only:
KOS Brass Quintet (Trombone, Euphonium)
Rapid City Municipal Band, Rapid City, SD (Euphonium)
Rapid City New Horizons Band (Euphonium)
That is to keep the moving slide from greasing your shirt and to prevent your shirt from getting in the way of the slide's smooth movement!
Dave Werden (ASCAP)
Euphonium Soloist, U.S. Coast Guard Band, retired
Adams Artist (Adams E3)
Alliance Mouthpiece (DC3)
YouTube: dwerden
Facebook: davewerden
Twitter: davewerden
Instagram: davewerdeneuphonium
Thanks to all. I bought the horn used, John.
As mentioned above, you normally see these when a horn has a trigger. It's possible your instrument originally had a trigger and was converted. BUT it may also have been a custom feature. Depending on one's physique, and on how far the tuning slide is usually pulled, I suppose this could be useful in the "stain prevention" category.
Dave Werden (ASCAP)
Euphonium Soloist, U.S. Coast Guard Band, retired
Adams Artist (Adams E3)
Alliance Mouthpiece (DC3)
YouTube: dwerden
Facebook: davewerden
Twitter: davewerden
Instagram: davewerdeneuphonium