Added the below image/entry to the 19th century timeline (2nd half). The image is related to a fairly large set of military images from the 19th and 20th centuries, many of which contain trombones.

c. 1885—Scotland: Military musicians from the The Gordon Highlanders, a British army infantry regiment from 1881 to 1994, are depicted in an image subtitled Drummer and Bandsman. The regiment takes its name from the Clan Gordon and recruits largely from Scotland (see facing image; public domain).