The Difference Should Be Obvious

I spent a couple of hours today playing Christmas music at at a Salvation Army Kettle.  The instrument that I played is an Eb Bass - a sort of Tuba.  But several times (more than five!) individuals passing by the kettle asked me if it was a French Horn.

So here is the lesson for today.

This is an Eb Bass

and this is a French Horn.

The difference should be fairly obvious.

And, just for clarification, this is a Trombone.