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After playing hundreds of horns over the years, I've noticed that a lot of the older horns (Bessons, Conns, etc.) seem to be made of much thicker brass. Can anyone elaborate on any reasons for this? Thanks!

Yup, specifically euphoniums and BBb tubas.

To me, it seems like thin = resonance and thick = projection. If you go too far on either side of the spectrum, its not really ideal.

bloke wrote:...

I could see myself being lulled into mistaking "vibrating in my hands" for "projection".

The only truth is what the ears in the audience hear.

Maybe the Alexander just projects more because it is a German style horn, rather than the thickness of metal?

I don't know, but something to consider?