Something happened after all the angel-trombonists of the 15th-18th centuries! I have just added the below image and caption to the Trombone History Timeline (19th century, 2nd half).

c. 1900—Austria: Trombone Player, a painting by Carl Siegfried Stoitzner (1866-1943), features a player who has apparently found his way to the cellar during a practice break (see below image; public domain).