TubeNet

But anyone know what the brass instrument in this video is?

https://youtu.be/K1ejInL_jdY" target="_blank

I think you'd call that a natural horn with a slide, or possibly a slide horn.
http://www.public.asu.edu/~jqerics/keyed_slide.htm" target="_blank

Dunno. But, WESSEX needs to clone it.

He needs to add a water key to each loop.

You all laugh, but I bet he would sell tens of them!!

Not sure exactly but it bears a strong resemblence to this:

the trumpet used by Gottfried Reiche in Bach's orchestra

Pete

Predictably, Laabs would attach poor Gottfried to it’s promotion without permission or compensation!!

The score calls for a horn or alternatively the right hand of the thorough bass organ to play a tutti line. Which would be quite high for a horn.

The more common baroque trumpets were long like the cavalry trumpet and had 1 or 2 loops depending on their pitch, mostly F, D, or C.

Then there was Reicha’s coiled trumpet.

For doubling the choir sopranos there was a rare tromba da tirarsi, slide trumpet.

This instrument here looks like a combination of the latter 2 variants. Until proven wrong I tend to doubt that it is based on a historical foundation.

The Reicha painting above here had some speculate about the finger positions of Reiche. Replicas were built with vents, where Reiche’s fingers touched the tubing. The vents helped stabilizing some pitches, so straight replicas also got vents.

However no historical instruments had vents until some post horns from the 19th century.

The short slide of the instrument here makes sense, as this trumpet only moves among its upper partials, where only a few positions are needed to make it chromatic.

Klaus