bass trumpet
bass trumpet is a valve trumpets with long air column (more than 2 m).
Overview
Low sounding member of the trumpet family.
In detail
bass trumpet is a valve trumpets with long air column (more than 2 m).
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Bass trumpet”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1114297: bass trumpet
Consult the source